Omega 2364

The Omega 2364 represents the first chronometer-certified reference utilizing the legendary caliber 30T2RG with subsidiary seconds at 6 o’clock, establishing the template for Omega’s serious pursuit of precision timekeeping in wristwatches during the 1940s. This was the movement that won first place for precision at the Kew Observatory trials in 1946, cementing Omega’s reputation during an era when chronometer certification meant something tangible: your watch had been tested by independent authorities and proven capable of maintaining accuracy under extreme conditions.​

The 2364 sits at the intersection of tool watch functionality and dress watch elegance. While the 30T2RG movement inside was robust enough to power British military timepieces through World War II, the 2364 itself was positioned as a premium dress chronometer, offering the same precision engineering in a refined package suitable for civilian wrists. The two-tone sector dials, applied numerals, and modest case proportions position this squarely as a sophisticated timepiece for those who valued accuracy without ostentation.​

Production numbers for the specific 2364 reference remain unconfirmed by factory records, though the broader 30T2 family reached approximately 3 million units across all variants between 1939 and 1963. The 30T2RG chronometer-grade subset represents a small fraction of this total output, with estimates suggesting the RG variants (both small and center seconds) accounting for perhaps 10-15% of production. Based on serial number ranges appearing in auction records and dealer listings, the 2364 likely saw production in the low thousands rather than tens of thousands, making original examples uncommon in today’s market. Scarcity increases substantially for examples retaining original dials, unpolished cases, and period-correct hands, as many underwent service replacements during the 1980s when Omega freely swapped components.​​

Collector interest in the 2364 remains steady among those who appreciate 1940s Omega chronometers and the 30T2RG movement specifically. Current market values range from approximately £2,000-3,000 ($2,500-4,000) for steel examples in good condition to £4,000-5,500 ($5,000-7,000) for 18k gold variants with original dials. Tropical dial examples, where the dial has aged from silvered tones to warm cream or champagne, command premiums of 20-40% when the patina is even and attractive. Unpolished cases with sharp geometry retain significantly more value than heavily polished examples that have lost their crisp edges and bevels.​

Historical Context, Provenance, and Manufacturing Details

Omega’s chronometer program emerged from the success of the caliber 30 family, first developed in 1938 under technical director Henri Gerber with design work led by Henri Kneuss. The base 30T2 movement entered production in February 1939, quickly proving its reliability through British Ministry of Defence contracts that eventually totaled 110,000 units during World War II, representing approximately 10% of Omega’s wartime output. This military validation provided the foundation for Omega’s pivot toward chronometer certification in the early 1940s.​

The 30T2RG variant, introduced in 1941, represented Omega’s entry into the chronometer wristwatch market. The “RG” designation indicates “red gilt,” referencing the movement’s distinctive rose gold-colored finish achieved through double copper plating on beryllium bronze, a treatment that improved both mechanical resistance and aesthetic appeal while preventing oxidation. More importantly, the RG variants received specialized regulation components including micro-screw regulators capable of adjustment to tolerances measured in seconds rather than minutes, essential for achieving chronometer certification.​

The 2364 reference specifically emerged as the first model to house the 30T2RG movement in a configuration with subsidiary seconds at 6 o’clock, differentiating it from center-seconds chronometer models that would follow. This positioning suggests Omega initially conceived the chronometer program around traditional dress watch aesthetics, where subsidiary seconds were considered more refined than center-mounted sweep seconds hands.​

The 2364’s direct predecessors include the reference 2144, which featured earlier chronometer movements including the R17.8 caliber in screw-back cases with straight lugs, produced from approximately 1940-1941. Following the 2364, Omega introduced the reference 2254 around 1946, which maintained the same stepped lug case design but featured a screw-back rather than snap-back construction. The 2366, also introduced in the mid-1940s, offered the 30T2SC RG movement with center seconds in a larger 35-36mm case, representing the jumbo variant for those preferring more wrist presence.​

Production occurred at Omega’s Bienne facilities, with cases supplied by various Swiss case manufacturers rather than made in-house. While specific case maker markings for the 2364 are rarely documented, Omega utilized suppliers including François Borgel’s firm (operated by Taubert & Fils after 1924), though Borgel cases typically featured screw-back construction rather than the snap-back design of the 2364. The snap-back design suggests simpler, lighter construction prioritizing elegance over water resistance, appropriate for a dress chronometer not intended for harsh conditions.​

The 2364 represents an important milestone in horological history not for groundbreaking innovation but for democratizing chronometer-grade timekeeping in wristwatches. Before references like the 2364, chronometer certification remained largely the domain of pocket watches and specialized marine chronometers. Omega’s success in producing chronometer-certified wristwatches at scale, combined with the 30T2RG’s proven accuracy at observatory competitions, helped establish that wristwatches could achieve precision timekeeping previously reserved for larger, more specialized instruments.​

Construction and Architecture

The 2364 utilizes a classic three-piece case construction with a main body, snap-on caseback, and separate bezel holding the crystal. Case diameter measures 33-34mm excluding the crown, with minor variations depending on whether you’re measuring the bezel diameter or the case body diameter. The 33mm dimension represents the more common size, though 34mm examples exist and may represent later production or specific sub-references. Case thickness ranges from 8-11mm depending on crystal height and case material, with gold cases generally measuring slightly thicker than steel examples due to material properties and construction techniques.​

Lug-to-lug measurements typically fall between 40-42mm, providing comfortable proportions for period-appropriate sizing. The lugs themselves feature a distinctive stepped design with polished bevels that catch light beautifully when the case retains its original geometry. These bevels are among the first casualties of overzealous polishing, and their preservation serves as a key indicator of case condition. Lug width measures 17mm, an unusual dimension that limits strap options somewhat but was standard for Omega watches in this size range during the 1940s.​

The case back utilizes a snap-fit press-in design rather than screw-back construction, distinguishing the 2364 from related chronometer references like the 2254. Inside the caseback, you’ll find the case serial number stamped along with Swiss hallmarks indicating metal content (585 for 14k gold, 750 for 18k gold, or “Acier Inoxydable” for stainless steel), the Omega logo, and typically the reference number “2364” though this was not universally stamped on all examples. The snap-back design provides adequate protection for daily wear but offers no meaningful water resistance, appropriate for a dress watch of this era.​

The 2364 was offered in multiple case materials including stainless steel, 14k yellow gold, 18k yellow gold, and 18k rose/pink gold. Steel examples are more commonly encountered today, though gold variants represent the majority of original production given the watch’s positioning as a premium chronometer. Case finishing combines polished surfaces on the bezel and lugs with brushed or polished case flanks depending on the specific example.​

Dial configurations show substantial variation within the 2364 reference, though certain design elements remain consistent. The most common and sought-after variant features a two-tone sector dial with a silvered outer chapter ring and contrasting center section, typically in a slightly different shade or finish creating subtle visual depth. This design incorporates applied numerals at 12, 3, 6, and 9 o’clock (or variations using applied Arabic numerals at all hour positions), with smaller applied dot markers at remaining positions. The crosshair or sector dial design includes printed minute tracks along the outer perimeter and often features printed fifth-of-a-second divisions, emphasizing the watch’s chronometer precision.​

The dial bears the Omega symbol applied at 12 o’clock, “Chronomètre” printed in an arched script below it, and “OMEGA” printed below the center pinion. At 6 o’clock, a recessed subsidiary seconds register provides running seconds indication. Some variants substitute applied Roman numerals for Arabic numerals, and simpler dial designs with applied markers and no numerals also exist, though these are less common and typically found on earlier production examples.​

Tropical dial variants, where the original silvered finish has aged to warm cream, champagne, or light brown tones, represent a subset that commands premiums when the aging is attractive and consistent. However, many so-called “tropical” dials are actually refinished dials that were poorly executed, and distinguishing between attractive natural aging and refinishing requires careful examination.​​

Original hands for the 2364 typically consist of gold-filled or gold leaf-style dauphine hands for hours and minutes, with a blued steel or matching gold seconds hand in the subsidiary register. The dauphine hand style features a distinctive taper toward the center with flared ends, elegant without being overly ornate. Lume was not standard on most 2364 examples, as the watch was positioned as a dress chronometer rather than a tool watch.​

The crystal is period-correct plexiglass (acrylic), typically domed to match the aesthetic of 1940s watches. Original crystals show the characteristic yellowing and micro-scratching of aged acrylic, though most examples today have had crystals replaced during service. Replacement plexiglass crystals remain inexpensive and widely available.​

The crown is typically unsigned on original examples, measuring approximately 3-4mm in diameter with fine knurling for grip. Many 2364 watches have had crowns replaced during service, and period-correct replacement crowns are difficult to source. The crown should pull out one position for time setting, with no hacking seconds function on the 30T2RG movement.​​

Sub-Reference Variations

| Sub-Reference | Case Material | Dial Type | Notes |
|—|—|—|
| 2364 (base) | Stainless steel | Two-tone sector dial | Most common configuration​ |
| 2364-2 | Stainless steel | Two-tone sector dial | Documented in auction records​ |
| 2364-5 | Stainless steel | Cream/silvered dial | Christie’s documented variant​ |
| OT 2364 | 18k yellow gold | Two-tone sector dial | “OT” prefix indicates gold case​ |
| CK 2364 | Various | Various | “CK” marking found on some examples​ |

Cross-Reference Data

Movements & Calibers

The 2364 exclusively uses the Omega caliber 30T2RG, the chronometer-grade variant of the legendary 30T2 movement family. The “RG” designation indicates the presence of specialized regulation components and the distinctive red gilt (rose gold) finish achieved through double copper plating on beryllium bronze base metal.​

Movement Specifications:

• Diameter: 30mm (13¼ lignes)​
• Thickness: Approximately 5.4mm​
• Jewel Count: 17 jewels​
• Frequency: 18,000 vph (2.5 Hz)​
• Power Reserve: 44 hours when fully wound​
• Lift Angle: 49 degrees​
• Escapement: Swiss lever​
• Hairspring: Breguet overcoil​
• Shock Protection: None on early examples, Incabloc on later variants from approximately 1943-1944 onward​
• Regulation: Micro-screw regulator (RG variant) for precision adjustment​

The 30T2RG represents a refined version of the base 30T2 movement, incorporating several upgrades necessary to achieve chronometer certification. The movement features specially selected components including matched balance wheels, premium hairsprings, and hand-fitted escapements. Dedicated “régleurs de précision” (precision regulators) adjusted each RG movement individually until it achieved chronometer performance, a labor-intensive process that partly explains the premium pricing of 2364 watches when new.​

The RG variant replaces the standard index regulator with an eccentric micro-regulator system capable of far more precise adjustment, permitting rate changes measured in fractions of seconds rather than full seconds. This precision was essential for observatory competition work where movements required adjustment to tolerances of 1-2 seconds per day across multiple positions.​

The movement’s architecture is deliberately simple, using two main bridges (one for the barrel, one for the train wheels) and a robust balance cock. This simplicity contributes to reliability and ease of service, qualities that made the 30T2 family successful with both military contracts and civilian watchmakers. The subsidiary seconds configuration in the 2364 differs from center-seconds 30T2SC RG variants, using a direct drive from the fourth wheel rather than the indirect central seconds mechanism required for sweep seconds hands.​

Chronometer certification for 2364 watches was typically performed by Swiss observatories (Neuchâtel, Geneva) or Britain’s Kew Observatory, with watches receiving a “Bulletin de Marche” (rate certificate) documenting the movement’s tested accuracy. These bulletins are extremely rare to find with watches today, as most were discarded or lost over decades of ownership changes. When present, they significantly enhance collector value and provide fascinating documentation of the specific movement’s performance.​

The 30T2RG achieved remarkable accuracy when properly regulated, with field performance often reaching +/- 5 seconds per day for well-maintained examples, and exceptional pieces approaching +/- 2-3 seconds daily. Military specification 30T2 SC movements supplied under the 6B/159 contract were regulated to within 10 seconds per day in four positions, demonstrating the caliber’s inherent capability when receiving proper attention from skilled regulators.​

No quickset date or hacking seconds functionality exists on the 30T2RG, as these features were not yet standard in 1940s movements. Time setting occurs via pulling the crown to one position and rotating to advance the hands. The movement winds smoothly with moderate resistance, requiring approximately 20-25 full rotations from fully unwound to fully wound.​​

Movement markings include “Omega,” “Swiss,” the caliber designation “30 T2 RG,” jewel count “17 Jewels,” and the movement serial number stamped on the movement plate. The red gilt finish should show a rose gold color across the bridges and plates, though this can darken or tarnish with age and improper storage.​

Identifying Original vs. Replaced Parts

Authentication of 2364 components requires careful examination, as service replacements and incorrect parts are common after 80+ years.

Dial Authentication:

Original 2364 dials show specific characteristics that distinguish them from refinished examples. The two-tone sector dials should exhibit subtle differences in finish or tone between the center section and outer chapter ring, achieved through different metal plating or surface treatments rather than paint. Applied numerals and markers should sit flush with the dial surface with no visible glue residue when examined under magnification. The crosshair or sector lines should be crisp and precisely printed, not hand-painted.​​

Original printing exhibits consistent line weight and sharp edges when viewed under 10x magnification. The “Omega” and “Chronomètre” script should match factory specifications, with the arched “Chronomètre” sitting proportionally below the Omega symbol. Period refinished dials often show printing inconsistencies including uneven letter spacing, incorrect fonts, or poor registration between different printing layers.​​

The subsidiary seconds register should be recessed below the main dial surface, not painted on. Original dials show this three-dimensional construction clearly when viewed from an angle. The minute track should maintain consistent spacing from the dial edge all around the perimeter.​​

Signs of refinishing include paint on applied hour markers or numerals (dial color should only be on the base plate, applied elements should remain free of paint), misaligned or poorly positioned applied elements, absence of “Swiss Made” marking at 6 o’clock on dials that should have it, incorrect fonts or spacing in printed text, and unnaturally perfect condition inconsistent with a watch’s age.​​

Many 2364 watches received service dials in the 1980s when Omega freely replaced dials during routine service. These service dials were factory-made but often differed from original specifications in subtle ways including slightly different dial finishes, modified printing, or different applied marker styles. While not “fake,” service dials substantially reduce collector value compared to original dials.​​

Hands Verification:

Original hands for the 2364 should be dauphine-style in gold-filled or solid gold matching the case material, with a characteristic taper toward the center and flared ends. The subsidiary seconds hand is typically blued steel or matching gold. Hands should show age-appropriate patina or wear, not pristine condition on an otherwise aged watch.​

Replacement hands are extremely common, as these delicate components bend easily and were often swapped during service. Period-incorrect hands include modern reproductions with wrong proportions, stick hands, baton hands, or alpha hands. The hole sizes for hands must match the caliber 30T2 specifications (hour hand 1.2-1.5mm, minute hand 0.70-0.90mm, subsidiary seconds 0.20-0.30mm).​

Crown Authentication:

Original crowns on 2364 watches are typically unsigned, small (3-4mm diameter), and feature fine knurling. Many 2364 watches have replacement crowns, as these components wear from decades of winding and were routinely replaced during service. While the Hodinkee listing mentions that the crown on their 2364 example is “likely a replacement part,” this reflects how common crown replacements are.​

Period-correct replacement crowns should be unsigned with proportions matching 1940s Omega standards. Modern replacement crowns often feature Omega logos that were not used on dress watches of this era, immediately identifying them as incorrect.​

Case Condition:

Original case geometry is crucial for value. The 2364’s stepped lugs feature polished bevels that create crisp edges when the case is unpolished. Heavy polishing rounds these edges, destroys the bevels, and reduces case dimensions, all of which significantly harm value. An unpolished case may show scratches and wear but will retain sharp transitions between polished and brushed surfaces, clearly defined lug shapes, and crisp hallmarks inside the caseback.​

The snap-back caseback should fit flush with no gaps, though decades of opening and closing may cause slight looseness. Inside the caseback, hallmarks should be deeply struck and clearly legible. Heavily polished cases often show weakened or partially removed hallmarks.​

Crystal:

Original crystals are plexiglass (acrylic), domed, and show the yellowing and micro-scratching typical of aged plastic. Most 2364 watches have had crystals replaced at some point, and this is considered acceptable maintenance rather than a detriment. Replacement plexiglass crystals should maintain period-correct profiles (domed, not flat) and appropriate dimensions for the case.​

Sapphire crystal replacements are incorrect for a 2364 and indicate modern modification. While sapphire offers superior scratch resistance, it changes the watch’s aesthetic and is not period-correct for 1940s dress watches.​

Collector Notes & Market Context

The 2364 occupies a solid middle tier in the vintage Omega collecting hierarchy. It lacks the cultural cachet of Speedmasters or the military provenance of 6B/159 specification watches, but offers genuine chronometer-grade timekeeping in an elegant package at prices well below comparable Patek Philippe or Vacheron Constantin chronometers from the same era.​

Current market positioning places steel examples with original dials and decent cases in the £2,000-3,000 ($2,500-4,000) range, while 18k gold variants reach £4,000-5,500 ($5,000-7,000). These prices assume good overall condition with original dial, correct hands, and unpolished or lightly polished case. The market shows steady rather than explosive demand, with prices gradually appreciating as collectors recognize the quality of 1940s Omega chronometers.​

Premium configurations that command higher prices include tropical dial examples with attractive, even patina (add 20-40% premium), completely unpolished cases with full geometry and deep hallmarks (add 15-25%), full sets with original box and papers (add 30-50%, though extremely rare), and 18k gold cases versus steel (typically 40-60% premium).​

The most sought-after variant is the 18k gold 2364 with two-tone sector dial, unpolished case, and full original box and papers. Only a handful of such complete examples exist in known collections, and they rarely come to market. When they do, prices can exceed £7,000 ($9,000) for exceptional examples.​

Common pitfalls when purchasing include refinished dials masquerading as original (carefully examine dial printing, applied elements, and proportions under magnification), heavily polished cases that have lost their original geometry (look for rounded lug edges and weak hallmarks), service replacement dials from the 1980s that differ from original specifications, incorrect or replacement hands, and movements that have been poorly serviced or contain incorrect parts.​​

Demand drivers for 2364 watches include the reputation of the 30T2RG movement among collectors who appreciate 1940s chronometer calibers, relative affordability compared to competitors like Patek Philippe Calatrava chronometers or Vacheron Constantin references from the same era, elegant sizing that wears well on modern wrists despite being 80+ years old, and the satisfaction of owning a genuine observatory-grade chronometer at accessible pricing.​

The market shows subtle regional variations, with European collectors (particularly in Switzerland, Germany, and the UK) demonstrating stronger interest than American collectors, where Speedmasters and Seamasters dominate Omega collecting. This creates occasional arbitrage opportunities for informed buyers willing to purchase from markets with lower demand.​

Wearability & Lifestyle Fit

The 2364 excels as a dress watch for those who appreciate vintage proportions and manual winding rituals. The 33-34mm case diameter reads smaller than modern standards but remains entirely wearable for most wrist sizes, particularly on slim or medium wrists where it achieves proper proportions. The thin profile (8-11mm depending on crystal) and moderate lug-to-lug distance (40-42mm) ensure the watch sits comfortably under dress shirt cuffs.​​

For daily wear viability, the 2364 requires realistic expectations. This is an 80+ year old watch with no water resistance, no shock protection on early examples, and a fragile acrylic crystal. Daily wear is certainly possible and even recommended to keep the movement lubricated, but requires care to avoid moisture exposure, impact, and excessive wear on the case. Many collectors successfully wear their 2364 watches several times per week in office environments or social occasions while avoiding situations involving water, physical activity, or rough conditions.​

The manual winding requirement appeals to some collectors who enjoy the daily interaction with their watch, while others find it inconvenient compared to automatic movements. Winding takes perhaps 30 seconds each morning and becomes part of a pleasant routine for enthusiasts. The 44-hour power reserve provides adequate weekend-off capacity if wound Friday evening.​​

Dress watch appropriateness is where the 2364 truly excels. The elegant two-tone sector dial, modest proportions, and restrained aesthetic make it perfect for formal wear, suits, and occasions requiring subtlety over flash. Gold variants elevate the formality, while steel examples offer versatility for both business and casual dress.​

Sport or tool watch suitability is essentially nil. The complete absence of water resistance, fragile crystal, and lack of robust construction make this inappropriate for any athletic activity. Even handwashing should be done carefully to avoid splashing the crown or caseback.​

Water resistance in practice is “not water resistant” by any modern standard. The snap-back case construction provides no meaningful water protection, and even light exposure to moisture risks damage to the movement. Treat the 2364 as if it were allergic to water.​

Comfort factors are generally excellent. The thin case, moderate weight (particularly on steel examples), and curved lugs allow the watch to conform to the wrist without excessive bulk. The 17mm lug width accommodates vintage leather straps nicely, and period-appropriate strap choices in brown or black leather complement the watch’s aesthetic. The Omega buckle, if original, should be preserved and transferred to new straps as these vintage buckles hold value.​​

Strap versatility is moderate. The 17mm lug width is an odd size that limits options compared to modern 18mm, 20mm, or 22mm standards. However, quality strap makers offer 17mm options, and vintage-style straps in brown leather, black leather, or tan complement the watch’s 1940s aesthetic. The 2364 looks wrong on modern NATO straps, rubber straps, or bracelets. Period-correct leather is the appropriate choice.​​

The watch suits collectors who appreciate understated elegance, value precision timekeeping history, enjoy manual winding movements, dress formally or business-casual regularly, and have realistic expectations about vintage watch limitations. It is less suitable for those seeking a daily beater watch, requiring water resistance for any reason, preferring modern proportions (40mm+), wanting automatic movements for convenience, or collecting only headline-grabbing references with strong resale potential