Omega 2398

The Omega 2398 represents one of the earliest references to house Omega’s chronometer-grade bumper automatic movements, a watch that epitomizes the convergence of mid-century elegance and mechanical innovation. Introduced in 1943 during the tumultuous final years of World War II, this reference showcased Omega’s commitment to precision timekeeping in a refined dress watch package. While the world was preoccupied with conflict, Swiss watchmakers were perfecting automatic winding technology, and the 2398 stands as a testament to this dedication to horological advancement.​

What distinguishes the 2398 from its contemporaries is its chronometer certification option. At a time when most automatic watches prioritized convenience over precision, Omega offered the 2398 with the Caliber 30.10 RA PC, a chronometer-grade bumper automatic that delivered observatory-level accuracy in a self-winding package. This combination of elegance, automatic convenience, and chronometric precision positioned the 2398 as a serious tool for those who demanded the best from their timepieces.​

The reference also gained legendary status through its rarest variants: the cloisonné enamel dial examples produced in 18-karat gold. These artistic masterpieces, featuring hand-painted floral motifs in vitreous enamel, represent some of the most valuable vintage Omega watches ever created, with examples selling at auction for over $56,000. While such pieces remain out of reach for most collectors, standard 2398 examples offer accessible entry into Omega’s early automatic era, combining genuine historical significance with wearable 34.5-35mm proportions.​

Omega automatic chronometer 2398-1 

History & Production Period

The Omega 2398 emerged in 1943, placing it among the earliest production references to utilize Omega’s bumper automatic technology in a civilian timepiece. This timing is historically significant: 1943 marked the year Omega introduced the Caliber 28.10 RA PC, the brand’s first automatic movement, though earlier prototypes and limited production pieces date back to 1942. The 2398 represented the maturation of this technology into diverse aesthetic expressions, from utilitarian stainless steel pieces to jewel-like gold examples with enamel dials.​

The reference’s development occurred during Omega’s intensive effort to perfect bumper automatic winding, a technology that predated the full-rotor automatic systems that would dominate from the mid-1950s onward. Omega designated these early automatics with the 30.10 RA PC caliber number, where “30.10” indicated the movement diameter in millimeters, “RA” stood for “Remontage Automatique” (automatic winding), “PC” meant “Poids Centré” (centered weight), referring to the oscillating rotor design.​

Production continued through the late 1940s with various sub-references introduced to accommodate different case materials and dial configurations. In 1949, Omega renumbered its movement designations, and the 30.10 RA PC became the Caliber 330, while an improved version received the Caliber 332 designation. This renumbering coincided with technical refinements that improved reliability and serviceability.​

Archive documentation confirms 2398 production through at least 1950, with examples documented from 1946, 1947, 1949, and 1950. The reference likely concluded production around 1953-1955 as Omega transitioned to full-rotor automatic movements like the Caliber 470, introduced in 1955. The 2398’s decade-long production run allowed for substantial variation in dials, movements, and case materials, creating complexity for modern collectors seeking to authenticate examples.​

The 2398 occupied an elevated position in Omega’s lineup. Unlike unnamed references or simple automatic models, chronometer-certified 2398 examples carried official COSC certification, documented through Geneva Observatory testing. This chronometer designation positioned the watch alongside Omega’s most prestigious offerings, competing with contemporary chronometer models from competitors like Rolex and Longines.​

Omega automatic chronometer 2398-1 

Technical Specifications

The Omega 2398 presents classic mid-century dress watch proportions that remain eminently wearable today:

The 34.5-35mm case diameter situates the 2398 squarely in the golden mean of vintage watch sizing. This diameter wears true to its measurement, neither punching above its weight like fancy-lug references nor appearing diminutive. The 41-43mm lug-to-lug dimension creates balanced proportions suitable for wrists from 6.5 to 7.5 inches.​

Case thickness measures a slim 9mm, impressive considering the bumper automatic movement housed within. This svelte profile resulted from Omega’s efficient movement architecture and thin case construction, allowing the 2398 to slide comfortably under dress shirt cuffs. The press-in caseback, while less robust than screw-down designs, contributed to this reduced thickness by eliminating threads and gasket retention systems.​

The 17-18mm lug width follows vintage Omega’s typical practice of using approximately half the case diameter for strap width. Period examples most likely came with 17mm or 17.5mm straps, though modern owners often use 18mm straps, as the 0.5mm difference proves imperceptible in practice. This width provides excellent strap variety without the limited options that plague smaller lug widths.​

The acrylic crystal reflects mid-1940s construction standards. While prone to scratching compared to sapphire, acrylic offers superior shatter resistance and can be polished to restore clarity. The domed acrylic crystal contributes to the watch’s vintage character, creating a gentle magnification effect when viewing the dial at angles.​

Critically, the 2398 lacks water resistance. The press-in caseback provides no gasket seal, and the crown is ungasketed. This construction suited its era, when wristwatches were removed before any water contact, but modern owners should avoid moisture exposure beyond hand washing.​

Omega Chronometer Reference 2398 Dress Watch 

Movements/Calibers

The Omega 2398 housed two closely related bumper automatic movements representing the pinnacle of this transitional winding technology.

Caliber 30.10 RA PC / Caliber 330 (1943-1949)

Early 2398 production utilized the Caliber 30.10 RA PC, Omega’s chronometer-grade bumper automatic. After 1949, Omega renumbered this movement as Caliber 330, though the technical specifications remained identical:​

• Jewel Count: 17 jewels
• Frequency: 19,800 vph (2.75 Hz)
• Power Reserve: 42 hours
• Diameter: 30.1mm
• Thickness: Approximately 4.8mm
• Construction: Beryllium bronze plates
• Finish: Pink/rose gold plating on plates
• Regulation: Observatory-grade regulation system
• Certification: COSC chronometer certified (select examples)

The Caliber 30.10 RA PC represents Omega’s first chronometer-grade automatic movement. The movement achieved remarkable precision through meticulous finishing, precise regulation, and quality control that allowed it to pass stringent observatory testing. Examples submitted for chronometer certification underwent 15-day testing across five positions and three temperatures, emerging with official certificates documenting their accuracy.​

The beryllium bronze construction provided durability and stability, while the characteristic pink finish on the plates reflected Omega’s aesthetic preferences of the era. The movement features a sub-seconds hand at 6 o’clock, distinguishing it from center-seconds variants like the Caliber 28.10 RA SC PC.​

The bumper automatic winding system employs an oscillating weight (rotor) that swings through approximately 270 degrees, hitting buffer springs at each end of travel. This motion engages a ratchet wheel that winds the mainspring unidirectionally. While less efficient than later full-rotor designs, the bumper system provided reliable automatic winding for active wearers.​

1949 OMEGA Bumper Automatic Watch Cal. 332 Ref. 2398-3 

Caliber 332 (1949-1955)

As production continued into the late 1940s, Omega introduced the Caliber 332, a refined evolution of the earlier bumper design:​

• Jewel Count: 17 jewels
• Frequency: 19,800 A/h (2.75 Hz)
• Power Reserve: 42 hours
• Diameter: 30.1mm
• Thickness: Approximately 4.8mm
• Development: Redesign of Caliber 331 (30.10 RA PC AM)
• Introduction: 1949

The Caliber 332 incorporated lessons learned from the earlier 30.10 RA PC/330, improving reliability and serviceability. The movement essentially mirrors the Caliber 331 (the antimagnetic version of the chronometer-grade 30.10 RA PC) but with cost-optimized production and standard finishing rather than chronometer-grade decoration.​

Despite being termed a “redesign,” the Caliber 332 maintained the core architecture of Omega’s 30.1mm bumper platform. The movement delivered reliable timekeeping suitable for daily wear, though it lacked the chronometer certification of its predecessor. Most 2398 examples from 1949-1955 contain the Caliber 332.​

Chronometer Certification Context

The availability of chronometer-certified 2398 examples distinguishes this reference within vintage Omega collecting. Chronometer certification required submission to an official testing bureau (typically the Geneva Observatory or Neuchâtel Observatory), where the movement underwent rigorous accuracy testing across multiple positions and temperatures. Only movements meeting strict standards received certification, documenting precision of +4 to -2 seconds per day or better.​

Omega archive extracts can confirm chronometer status for surviving examples, providing provenance documentation that enhances collector value. These extracts detail the watch’s original production date, destination market, and certification status.​

Service Considerations

Bumper automatic movements require watchmakers with specialized knowledge of this transitional technology. The oscillating rotor mechanism, buffer springs, and ratchet wheel design differ substantially from both manual-wind and full-rotor automatic movements. Improper service can damage delicate components, leading to expensive repairs or irreparable harm.

Service intervals of 4-5 years maintain optimal performance. The constant hammer action accelerates wear on the ratchet wheel and buffer springs compared to full-rotor automatics, making regular maintenance particularly important. Service costs typically range from $400-700 USD for complete overhaul by experienced watchmakers.

1949 OMEGA Bumper Automatic Watch Cal. 332 Ref. 2398-3 

Dial Variations

The Omega 2398 appeared with remarkable dial diversity, from restrained silver dials to artistic masterpieces in cloisonné enamel. Understanding these variations proves essential for authentication and appreciation.

Standard Silver and Cream Dials

The most common 2398 configuration features a silver or cream dial with applied hour markers. These dials typically display:​

• Applied metal hour markers (faceted or geometric shapes)
• Sub-seconds dial at 6 o’clock with printed divisions
• Omega signature at 12 o’clock
• “Swiss Made” designation at 6 o’clock below sub-dial
• Dauphine hands in matching metal finish

Original silver dials age gracefully, developing warm patina ranging from cream to light champagne tones. This natural aging confirms originality and adds character. Conversely, overly bright or pure white dials often indicate refinishing, as the lacquer naturally yellows over decades.​

The applied hour markers represent a key authentication point. Original markers sit precisely flush with the dial surface, displaying period-appropriate finishing (high polish or fine brushing depending on variant). The markers’ multi-faceted construction allows them to catch light from multiple angles, creating visual interest that flat printed markers cannot achieve.​

Omega Chronometer Reference 2398 Dress Watch 

Black Gilt Dials

Less common than silver variants, black gilt dials command collector attention when original. These dials feature:​

• Black lacquer base with warm patina development
• Gilt (gold-toned) Arabic numerals at 2, 4, 6, 8, 10, and 12
• Gilt hour markers at remaining positions
• Gilt dauphine hands
• Gilt printing for all text elements

The combination of black and gold creates dramatic contrast that suits formal wearing contexts. However, black dial 2398 examples require particular scrutiny, as refinishing is rampant on these variants. Many examples on the market feature repainted dials with modern lacquer that lacks appropriate aging and patina.​

Vintage Omega Swiss Watch, Automatic Bumper, Ref. 2398, Black gilt dial 

Two-Tone Dials

Rare two-tone dial configurations appeared on select 2398 examples, featuring contrasting center and outer zones. These dials typically display darker outer rings surrounding lighter central sections, creating depth and visual interest. The transition between zones should appear crisp and intentional on original examples; sloppy transitions suggest refinishing or conversion attempts.​

Omega CK 2398 Calatrava Nice Condition Cal 332 Rare Dual  

Cloisonné Enamel Dials

The most celebrated and valuable 2398 variants feature cloisonné enamel dials with hand-painted floral or decorative motifs. These artistic masterpieces appeared exclusively on 18-karat gold “OT 2398” references and represent some of the rarest vintage Omega watches produced.​

The cloisonné technique involves:

• Creating thin gold wire partitions (cloisons) on the dial surface
• Filling compartments with vitreous enamel paste
• Multiple firings at high temperature to fuse the enamel
• Polishing to create a smooth, glossy surface

Each cloisonné dial required skilled artisans and dozens of hours to complete. The floral motifs typically featured naturalistic designs with multiple colors creating botanical scenes of remarkable delicacy. These dials were never mass-produced; each represents essentially a unique artistic creation.​

A cloisonné enamel dial 2398 sold at Phillips auction in 2018 for $56,250 USD against an estimate of $30,000-50,000, demonstrating the extraordinary value these pieces command. Such examples appear at auction perhaps once every few years, making them among the rarest production Omega watches collectors can pursue.​

OMEGA, REF. OT 2398, A FINE GOLD AUTOMATIC WRISTWATCH WITH  

Dial Furniture Details

Hands across all dial variants typically follow the dauphine style: flat, faceted hands that taper to a point. The hands should match the case material and dial aesthetic: polished steel on steel cases with silver dials, gilt on black gilt dials, gold on solid gold examples. Original hands display age-appropriate patina matching the dial; mismatched aging indicates parts replacement.​

The sub-seconds dial at 6 o’clock features concentric rings and divisions printed in matching colors to the main dial. This subdial should show consistent aging with the main dial surface; differential aging suggests refinishing of one component.​

Many 2398 dials feature no luminous material whatsoever, positioning the watch as a pure dress piece. When lume appears on hour markers or hands, it consists of radium-based compounds that age to yellowish-brown or orange tones. Bright, fresh-looking lume on a 75+ year old watch immediately raises authenticity questions.​

Vintage Omega Swiss Watch, Automatic Bumper, Ref. 2398, Black gilt dial 

Case & Bezel Variations

The Omega 2398’s case variations span from utilitarian stainless steel to precious metal examples representing the pinnacle of mid-century watchmaking.

Sub-Reference Breakdown and Materials

2398-1: Stainless steel throughout, representing the most common and accessible configuration. All-steel examples showcase clean, unfussy design with brushed lug surfaces and polished case sides. The press-in caseback carries “Omega Watch Co. Fab. Suisse, Stainless Steel, 2398-1” engravings.​

2398-2: Stainless steel variant, documented from 1945. The exact differentiation from 2398-1 remains unclear in available documentation, suggesting possible subtle case detail variations or manufacturer organizational purposes rather than obvious material differences.​​

2398-3: Stainless steel case documented with Caliber 332 movements, primarily from 1949. This sub-reference likely represents post-1949 production when Omega transitioned to the Caliber 332 from the earlier 30.10 RA PC/330.​

2398-5: Men’s automatic variant in stainless steel. Limited documentation exists for this sub-reference, but period advertisements confirm its existence within the 2398 family.​

OT 2398: The legendary variant produced in 18-karat solid gold, typically featuring cloisonné enamel dials. “OT” likely designates “Or” (gold) or represents an internal Omega coding system for precious metal special editions. These examples command extraordinary prices and represent the artistic zenith of the reference.​

Gold-Filled and Plated Examples: Some 2398 production utilized gold-filled cases (thicker gold layer bonded to base metal) or gold plating. These two-tone construction methods provided gold aesthetics at more accessible price points than solid gold, though over-polishing can wear through the gold layer, revealing base metal beneath.​

Solid Gold Examples: Beyond the cloisonné enamel OT 2398, some standard-dial examples appeared in 18-karat yellow or rose gold. These command premiums over steel but remain more accessible than the enamel dial variants.​

Case Construction

The 2398 employs three-piece construction: integrated bezel and main case body, plus press-in (snap-on) caseback. This design prioritized slimness and elegance over water resistance, reflecting dress watch priorities of the 1940s.​

The press-in caseback features a beveled edge that snaps into a corresponding groove in the case body. Opening requires a case knife carefully inserted at the caseback notch; closing demands even pressure around the perimeter to snap the back into place. This design proves more challenging to service than screw-down casebacks and offers no water resistance benefits.​​

The crown follows Omega’s period-correct styling, featuring the Omega logo in relief on the crown face. The crown is not gasketed and should only finger-tighten against the case tube. Original crowns should match the case material: steel for stainless examples, gold for precious metal variants.​

Caseback Markings

Proper press-in casebacks display period-appropriate engravings including:

• “Omega Watch Co” or similar manufacturer designation
• “Fab. Suisse” or “Swiss Made”
• Material marking (Stainless Steel, 18K, etc.)
• Reference number (2398-1, 2398-2, etc.)
• Serial number (typically 8 digits)

The interior of the caseback should show movement clamping ring grooves and appropriate wear from decades of removal and reinstallation during service. Pristine interior surfaces on a 75+ year old watch suggest replacement casebacks or recent refinishing.

Vintage Omega Swiss Watch, Automatic Bumper, Ref. 2398, Black gilt dial 

Bracelet & Strap Options

The Omega 2398 was originally sold on leather straps, reflecting both its dress watch positioning and the absence of water resistance that would encourage bracelet wearing.

Period-Correct Strap Configurations

Original 2398 examples came on leather straps in 17mm or 17.5mm widths, though modern replacement often uses 18mm straps given the negligible fit difference. Omega-signed buckles in matching case material completed the presentation: steel buckles on stainless steel watches, gold-plated or solid gold buckles on precious metal examples.​

Period-correct strap styles included:

• Plain calf leather in black or brown
• Crocodile or alligator grain patterns
• Lizard skin textures
• Width typically uniform (non-tapering) or slight taper to 16mm at buckle

Finding original 1940s-1950s Omega straps in good condition proves challenging, as leather degrades over 70+ years. Most surviving examples show cracking, stiffness, or complete deterioration.

Modern Strap Choices

Contemporary owners enjoy excellent leather strap options for the 17-18mm lug width. Quality straps from makers like Hirsch, Delugs, or Camille Fournet suit the 2398 well:

Color Recommendations:

• Black calf leather for formal contexts
• Brown leather in tan or cognac tones for versatility
• Burgundy or oxblood cordovan for distinguished character
• Grey suede for casual wearing

Style Recommendations:

• Plain calf leather with minimal stitching maintains period correctness
• Vintage-style straps with contrasting stitching add visual interest
• Shell cordovan provides luxury and longevity
• Avoid heavily padded or modern sporty designs that clash with dress watch character

The 2398’s vintage aesthetic suits traditional leather strap styles rather than NATO straps, rubber, or modern mesh bracelets. The dress watch proportions and lack of water resistance make leather the natural choice both practically and aesthetically.

Bracelet Considerations

While not originally offered on metal bracelets, some collectors fit period-appropriate Omega bracelets from the 1950s. However, this approach seems incongruous with the 2398’s dress watch character and lack of water resistance. Most serious collectors maintain these watches on leather straps, preserving the formal aesthetic Omega intended.

Identifying Original vs. Replaced Parts

Authentication of the Omega 2398 requires systematic examination, as these vintage pieces frequently contain refinished dials, replaced parts, or other alterations that diminish collector value.

Dial Authentication

Dial refinishing represents perhaps the most prevalent issue with vintage 2398 examples. Multiple sources explicitly warn that redials are “extremely common” and “overwhelming” on watches from this era.​​

Typography and Printing Quality:

Original Omega dials exhibit razor-sharp printing under 10x magnification. The Omega logo, text, and numerals should display perfect edge definition and consistent ink density. Refinished dials frequently show:​​

• Slightly fuzzy or thick printing edges
• Inconsistent letter spacing
• Ink density variations across the dial
• Modern fonts that don’t match period-correct styles

The Omega signature requires particular scrutiny. The distinctive logo should match period-correct fonts precisely, with proper proportions and serif details. Reproductions often err in symbol size, letter spacing, or overall proportions.​

Arabic Numeral Variants:

Black dial examples with Arabic numerals at 2-4-6-8-10-12 require special caution, as these are “often refinished” according to collector forums. The numerals should display consistent stroke width, proper font characteristics, and appropriate aging. Thick, bold numerals suggest modern repainting.​

Crosshair Assessment:

For dials featuring crosshairs on the sub-seconds register, the lines should be extremely fine and precise. Thick, bold crosshair lines indicate refinishing, as original printing equipment produced much finer lines than modern dial restoration achieves.​

Patina Consistency:

Overall dial aging should appear organic and consistent. Artificially aged dials often show:​

• Overly uniform discoloration
• Suspicious spotting patterns
• Mismatched aging between main dial and sub-seconds register
• Differential aging between dial surface and applied markers

On dials featuring luminous material, the lume patina color should match across all hour markers and hands. Mismatched lume aging definitively indicates parts replacement or dial restoration.​

Applied Marker Verification:

Original applied hour markers sit precisely flush with the dial surface. Examine the markers under magnification for:​

• Clean mounting with no visible adhesive
• Consistent finishing across all markers
• Period-appropriate shapes and faceting
• No gaps between marker base and dial surface

Replacement or refurbished markers may sit slightly proud, show tool marks around mounting pins, or display inconsistent finishing.

Professional Refinishing:

Some 2398 examples underwent professional dial restoration by Omega or expert specialists. While these retain functional value, they command significantly lower prices than original-dial examples among serious collectors. Only accept refinished dials if:​​

• The dial was refinished by the original manufacturer (Omega)
• The watch has exceptional sentimental value overriding originality concerns
• The watch is so rare that original examples never appear on the market

For the 2398, original examples appear regularly enough that collectors should exercise patience finding unrestored pieces rather than accepting refinished dials.

Vintage Omega Swiss Watch, Automatic Bumper, Ref. 2398, Black gilt dial 

Movement Verification

Correct Caliber and Serial Number Correlation:

• Caliber 30.10 RA PC / 330: Movement serial numbers in 10,000,000-12,999,999 range (1943-1949)​
• Caliber 332: Movement serial numbers in 12,000,000-14,999,999 range (1949-1955)​

The movement should be signed “Omega Watch Co Swiss” with jewel count “17 Jewels” clearly marked. The caliber number (30.10 RA PC, 330, or 332) should appear on the movement plates or barrel bridge.​

For chronometer-certified examples, additional markings should include “Chronometre” or “Chronometer” engraving. The movement should display finer finishing than standard-grade calibers, with polished steel parts and meticulous decoration.​

Movement Condition Assessment:

The bumper mechanism should operate with characteristic gentle thumping when the watch is moved. The beryllium bronze plates should show appropriate age patina without excessive corrosion or rust. Pink or rose-gold plating on the plates confirms period-correct execution.​

Previous service is expected and acceptable; look for professional workmanship rather than amateur repairs. Signs of poor service include:

• Random screwdriver marks on screws
• Excessive oil or dirt accumulation
• Missing or damaged parts
• Altered or filed components

Chronometer Documentation:

For examples claiming chronometer certification, seek supporting documentation when possible. Omega archive extracts can confirm chronometer status, original production date, and destination market. These extracts cost approximately 150-200 CHF from Omega and provide valuable provenance documentation that enhances collector value and authentication confidence.​

Crown and Crystal Authentication

Crown Verification:

The correct crown for the 2398 features the Omega logo in relief and should match the case material finish. Generic replacement crowns are extremely common on vintage watches. While functionally adequate, replacement crowns detract from originality and value.​

The crown should thread smoothly onto the winding stem without excessive play. The crown tube should show appropriate age and patina matching the case. Fresh, bright crown tubes on otherwise aged cases suggest recent replacement.

Crystal:

Original acrylic crystals provide authentic presentation but may show decades of scratching. Replacement acrylic crystals are acceptable from a collector standpoint, as crystals are considered wear items requiring periodic replacement. Some collectors prefer original crystals with minor scratches over modern replacements, viewing honest wear as part of the watch’s story.​

Ensure any replacement crystal fits properly with appropriate dome height and diameter. Poorly fitted crystals can create pressure on the dial, causing damage.

Case Condition Assessment

Polishing Detection:

Over-polishing represents one of the most value-destroying conditions for vintage watches. The 2398’s simple round case makes polishing damage somewhat less obvious than on fancy-lug references, but excessive refinishing still destroys value. Signs include:

• Loss of crisp case edges
• Uneven surfaces or “wavy” profiles
• Thinning of lugs or case flanks
• Removal or weakening of caseback engravings
• Rounded edges where sharp transitions should appear​

An unpolished or lightly polished 2398 with sharp case geometry commands premiums of 30-40% over heavily polished examples. Light “preservation” polishing that maintains original case architecture is generally acceptable to collectors.

Gold-Plated Case Considerations:

For gold-plated or gold-filled examples, examine the case carefully for wear-through revealing base metal beneath. Common wear areas include:​

• Lug tips and edges
• Case back rim
• Crown area from frequent winding
• Areas where the case contacts the wrist

Significant wear-through dramatically reduces value, as replating rarely achieves factory-quality results. Original, unpolished gold plating commands strong premiums even if showing light wear, as it documents authentic aging.

Caseback Verification:

The press-in caseback should carry appropriate period markings matching the sub-reference. Inside the caseback, proper stampings should include Omega markings, material designation, and reference numbers.​

Service replacement casebacks occasionally appear, identifiable through:

• Incorrect engraving styles or fonts
• Wrong reference numbers
• Missing serial numbers
• Generic “Swiss Made” without Omega attribution

Wear Pattern Assessment:

Authentic vintage examples show wear concentrated in predictable areas: case edges, lug tips, caseback rim, crown, and crystal edges. Wear should appear consistent with age. If the case shows significant wear but the dial appears pristine, suspect dial refinishing.​

Common Alterations to Avoid

Refinished Dials: The most common and value-destroying issue. Many 2398 examples feature “restored” dials with overly perfect appearance. Original dials, even with light patina or minor imperfections, command premiums of 50-100% over refinished examples among knowledgeable collectors.​

Incorrect Movements: Some examples contain wrong-era movements or non-Omega calibers installed during repairs. Always verify the correct Caliber 30.10 RA PC/330 or 332 with serial numbers matching 1943-1955 production.​

Conversion Dials: Occasionally, black dial variants result from conversions where silver dials were painted black and new printing applied. These lack the authentic layering and aging of original black dials.​

Parts-Bin Assemblies: “Frankenwatches” combine authentic components that don’t belong together. Mismatched patina between dial and hands provides the clearest indicator. Case reference numbers should align with documented sub-references (2398-1, 2398-2, 2398-3, etc.).​

Over-Restored Examples: Some sellers describe heavily restored pieces as “original”. Examine photographs under magnification, scrutinize printing quality, assess patina consistency, and verify case sharpness before purchasing.​​

1949 OMEGA Bumper Automatic Watch Cal. 332 Ref. 2398-3 

Collector Notes & Market Context

The Omega 2398 occupies a fascinating niche: an early chronometer-grade automatic with genuine historical significance, yet it remains accessible due to limited name recognition outside serious Omega collectors.

Current Market Positioning

As of late 2025, the Omega 2398 trades at values reflecting quality and scarcity while remaining well below sport watch pricing:

Standard Stainless Steel Examples (2398-1, 2398-2, 2398-3):

• Fair Condition (refinished dial, heavy wear): $500-800 USD
• Good Condition (refinished dial, light wear): $800-1,200 USD
• Very Good Condition (original dial, moderate wear): $1,200-1,800 USD​
• Excellent Condition (original dial, light wear, unpolished case): $1,800-2,500 USD
• Exceptional (chronometer-certified with archive extract): $2,500-4,000 USD​

Gold-Filled and Gold-Plated Examples:

• Fair to Good Condition: $700-1,300 USD​
• Very Good to Excellent Condition: $1,300-2,200 USD

Solid Gold Examples (excluding enamel dials):

• 18K Yellow Gold: $2,500-4,500 USD depending on condition​
• 18K Rose/Pink Gold: $2,800-5,000 USD (rose gold commands premium)
• With chronometer certification: +$1,000-2,000

Cloisonné Enamel Dial Examples (OT 2398):

• Auction estimate: $30,000-50,000 USD​
• Recent auction result: $56,250 USD​
• Private market: $40,000-70,000 USD depending on enamel condition and motif complexity

Premium Factors:

• Original dial (unrefined): +50-100%
• Chronometer certification with papers: +40-60%
• Omega archive extract: +20-30%
• Unpolished case with sharp geometry: +30-40%
• All-original configuration (dial, hands, crown, crystal): +25-40%
• Solid gold case: 2-3× steel equivalent value
• Cloisonné enamel dial: 30-50× steel equivalent value

What Collectors Seek

Most Desirable Configurations:

1. Cloisonné Enamel Dial Examples: The holy grail of 2398 collecting, these artistic masterpieces represent ultimate rarity and value. Examples appear at major auction houses perhaps once every 2-3 years.​
2. Chronometer-Certified Examples with Documentation: Original COSC certificates or Omega archive extracts documenting chronometer status elevate these pieces to serious collecting territory. These represent the technical pinnacle of the reference.​
3. Original Dial Examples: Given the prevalence of refinishing, watches with genuine original dials in any condition command strong premiums. Even moderate patina or minor imperfections are vastly preferable to refinished dials among knowledgeable collectors.​
4. Solid Gold with Rose/Pink Gold Cases: The warm tones of rose gold complement aged dials beautifully, making these among the most aesthetically pleasing variants.​
5. Complete Sets with Box and Papers: Examples retaining original presentation boxes and papers are extraordinarily rare for a reference from 1943-1955. Such complete sets command premiums of 40-60%.
6. Black Gilt Dial Examples (Original Only): When genuine and original, black gilt dials create striking contrast, but authentication is critical given widespread refinishing.​

Appeal to Collectors

The 2398 attracts several collector profiles:

Early Automatic Enthusiasts: For those fascinated by the evolution of automatic winding, the 2398 offers an accessible entry point to chronometer-grade bumper movements. The reference represents genuine innovation with historical documentation through Omega’s archives.​

Dress Watch Collectors: The classic 34.5-35mm proportions and refined aesthetics suit collectors seeking elegant vintage pieces for formal occasions. The sub-seconds dial adds visual interest without complicating readability.​

Value-Conscious Omega Collectors: Those seeking quality vintage Omega without Seamaster or Constellation premiums find excellent value in the 2398. The reference offers genuine Omega quality, interesting history, and chronometer-grade movements at accessible prices.

Artistic/Enamel Dial Collectors: The cloisonné enamel variants attract collectors focused on artistic dial execution and rare complications beyond simple timekeeping. These pieces transcend watchmaking to become wearable art.​

Common Pitfalls

What to Avoid:

Refinished Dials: The overwhelming prevalence of redials on 2398 examples requires extreme caution. Many examples on the market feature “restored” dials with modern lacquer, incorrect fonts, and artificial aging. Original dials, even with honest wear, command premiums of 50-100% over refinished examples.​​

Black Dial Examples Without Verification: Black dials with Arabic numerals are “often refinished” according to collector forums. Unless purchased from reputable dealers or authenticated by experts, assume black dial examples have been restored.​

Over-Polished Cases: Heavy refinishing destroys case geometry and removes original finishing. This damage is permanent and significantly impacts value.​

Generic Replacement Parts: Crowns, crystals, and casebacks are frequently replaced during service. While crystals are acceptable replacements, incorrect crowns and casebacks detract from authenticity.​

Movement Replacements: Verify the correct Caliber 30.10 RA PC/330 or 332 with serial numbers matching the 1943-1955 production window. Some examples contain wrong-era or non-Omega movements installed during desperate repairs.​

Exaggerated Claims: Sellers sometimes describe refinished examples as “restored by Omega” or “factory refurbished” to justify pricing. Demand documentation for any restoration claims.​​

Gold-Plated Wear-Through: For plated examples, significant wear-through to base metal dramatically reduces value. Unless priced accordingly (under $800), avoid examples with substantial plating loss.​

Service and Maintenance Considerations

Bumper automatic movements require watchmakers experienced specifically with this transitional technology. The oscillating rotor mechanism, buffer springs, and ratchet wheel represent unique complications that general watchmakers may not understand thoroughly.

Service costs for Caliber 30.10 RA PC/330 or 332 typically range from $400-700 USD for complete overhaul including cleaning, lubrication, timing adjustment, and parts replacement. Budget for service every 4-5 years to maintain optimal performance, as the constant hammer action accelerates wear compared to full-rotor automatics.​

Common Service Issues:

• Worn buffer springs requiring replacement
• Ratchet wheel wear after 75+ years of operation
• Mainspring fatigue (replacement recommended)
• Press-in caseback warping or damage from improper opening/closing​
• Crystal and gasket deterioration

The press-in caseback requires careful handling during service. Improper closing can warp the caseback or damage the case rim. Ensure your watchmaker has experience with press-in designs and proper closing tools.​​

Given the complete absence of water resistance, avoid any moisture exposure beyond hand washing. The ungasketed crown and press-in caseback provide no protection against moisture ingress.​

Investment Perspective

The Omega 2398 represents a compelling value proposition for collectors seeking genuine Omega quality and historical significance without contemporary pricing:

Strengths:

• Genuine early chronometer-grade automatic (1943 introduction)
• Historically significant bumper automatic technology
• Beautiful mid-century dress watch aesthetics
• Wearable 34.5-35mm sizing
• Relative affordability compared to sport references
• Chronometer certification available on select examples
• Potential for exceptional finds (cloisonné enamel dials)
• Strong archive support from Omega

Considerations:

• Not a household name like Speedmaster or Seamaster
• Requires regular service to maintain bumper mechanism
• Refinished dials extremely common, requiring careful authentication
• No water resistance limits practical daily wearing
• Less liquid market than modern Omega references
• Press-in casebacks more fragile than screw-down designs

Market Outlook:

The 2398 sits at an interesting inflection point. As vintage Omega knowledge deepens among collectors, the premium for authenticity widens dramatically. Original-dial examples in excellent condition have appreciated 40-60% over the past 5 years, while refinished examples have stagnated or declined.

Cloisonné enamel dial examples represent blue-chip vintage Omega, with the $56,250 auction result in 2018 establishing a new benchmark. These pieces will likely appreciate steadily as serious collectors recognize their artistic and historical significance.​

For standard steel examples, the key to appreciation lies in finding genuinely original pieces. As collector sophistication increases, the market increasingly rejects refinished dials, over-polished cases, and parts-bin assemblies. An all-original 2398 with chronometer certification and sharp case may appreciate substantially over the next decade, while restored examples will struggle to gain value.

The reference benefits from Omega’s archive service, which provides authentication and provenance documentation unavailable for many vintage brands. This archive support enhances confidence and should support long-term value appreciation for documented examples.​

Conclusion

The Omega 2398 stands as a testament to Omega’s commitment to precision and elegance during the formative years of automatic wristwatch development. Introduced in 1943 as the world struggled through its darkest hour, this reference represented Swiss watchmaking’s unwavering dedication to excellence: chronometer-grade accuracy in an elegant, self-winding package.

While lacking the household recognition of the Speedmaster or Seamaster, the 2398 offers something arguably more valuable: genuine historical significance at accessible prices. This is a watch that participated in the evolution of modern automatic timekeeping, housing some of Omega’s earliest chronometer-certified automatic movements. For collectors who appreciate substance over hype, the 2398 delivers compelling value.

The reference rewards careful study and patience. Finding an all-original example with unrefined dial, proper movement, and unpolished case requires diligence, but such pieces represent authentic connections to mid-century Swiss watchmaking at its finest. Whether drawn to chronometer-certified examples, artistic cloisonné enamel variants, or simply elegant dress watches with interesting history, the Omega 2398 merits serious consideration from discerning collectors.

For those fortunate enough to encounter a cloisonné enamel dial example, recognize it as one of vintage Omega’s greatest treasures: a fusion of haute horlogerie and artistic craft that transcends simple timekeeping to become wearable art. But even standard examples offer genuine quality, historical significance, and the satisfaction of wearing a watch that helped define automatic wristwatch development during horology’s golden age.