Omega DeVille 166.033

The Omega DeVille 166.033 (also cataloged as ST 166.0033) is a vintage automatic wristwatch produced by Omega primarily between 1966 and 1972. This model is significant as it represents the De Ville line after it became an independent collection in 1967, moving away from its earlier association with the Seamaster line to establish its own identity focused on urban sophistication and modern elegance. The 166.033 typically features a 34-35mm case, often of a “Unishell” (monocoque) construction requiring a special “Tool 106” for opening, and is predominantly powered by the reliable Omega Caliber 565 automatic movement, known for its quick-set date function. It was offered in stainless steel, gold-plated, and solid gold variations, with dial options including silver, grey linen, and champagne, sometimes co-branded with the retailer “Meister.”  

Specifications

Key Details & Variations

Variations

The Omega De Ville 166.033 was available in several configurations:

• Case Materials: Stainless steel was common. Gold-plated versions (often 14k or other micron thicknesses over steel) offered a touch of luxury. Solid gold cases, primarily in 14k or 18k yellow gold, were the premium options.  
• Dial Colors and Finishes:
  • Silver or white dials were prevalent, often with a sunburst or brushed finish.  
  • A distinctive and rarer “slate grey linen dial” is a sought-after variant.  
  • Champagne or gold-toned dials were typically paired with gold or gold-plated cases.  
  • “Meister” Co-branded Dials: Exceptionally rare and valuable are dials co-branded with “Meister,” a prestigious Zurich-based retailer. These indicate the watch was originally sold through this exclusive outlet.  
• Lume: Many examples featured Tritium lume on the hands and as plots by the hour markers. Non-luminous dial versions also existed, offering a cleaner dress watch aesthetic.  

Correct Dial

• Markings: Applied Omega logo (Ω). Printed “OMEGA,” “De Ville,” and often “AUTOMATIC.” “SWISS MADE” or “T SWISS MADE T” (if Tritium lumed) at the bottom edge.
• Date Window: Positioned at 3 o’clock.  
• Indices: Typically applied metal baton-style hour markers.  
• “Meister” Signature: If co-branded, the “Meister” script would appear on the dial, usually below the Omega branding or near 6 o’clock.  

Correct Hands

• Style: Commonly Dauphine or stick-shaped hands.  
• Finish/Lume: Could be plain, feature contrasting black inlays/stripes for legibility, or have Tritium luminous inserts.  

Correct Case

• Design: Predominantly a “Unishell” or monocoque construction, meaning the case is a single piece and the movement is accessed from the front by removing the crystal and bezel assembly. The case back is integral and not removable in the traditional sense.  
• “TOOL 106” Marking: Unishell case backs are often engraved “TOOL 106” (or similar), indicating the specific Omega tool needed to open the case.  
• Dimensions: Diameter typically 34-35mm (excluding crown), lug-to-lug around 37-39mm, and thickness about 10-10.9mm. Lug width is usually 18mm.  
• External Case Back Markings: Engravings usually include “De Ville,” the Omega logo, and sometimes “WATERPROOF.” Unlike Seamaster De Villes, standalone De Villes like the 166.033 typically do not feature the Seamaster Hippocampus logo.  
• Crown: Original Omega-signed crown.  

Additional Details

The Omega De Ville 166.033 is most commonly and officially powered by the Omega Caliber 565.  

• Type: Automatic (self-winding) with a central rotor.
• Jewels: 24 jewels.  
• Frequency: 19,800 vph.  
• Power Reserve: Approximately 50 hours.  
• Quick-Set Date: A key feature, activated by repeatedly pulling the crown to its outer position. It’s advised not to use this function between 10 PM and 2 AM.  
• Reputation: Part of Omega’s highly regarded 550-700 series, known for robustness, reliability, and accuracy. Considered a product of Omega’s “golden era” of movement manufacturing.  
• Caliber 1001 Mention: Some isolated listings mention the Caliber 1001. This is a later Omega movement series. While a very late production 166.033 (e.g., 1972) or a service replacement could potentially house a Cal. 1001, the Cal. 565 is the standard and period-authentic movement for this reference.  

Original crystals were acrylic (Plexiglass/Hesalite), often featuring a tiny, centrally etched Omega logo (Ω) as an authenticity mark.  

Original Bracelet/Strap Options

• Omega Ref. 1037 “Beads of Rice” (BoR) Bracelet: A highly desirable flat-link BoR bracelet, often cited with 564 end links (though lug width compatibility needs verification for the 18mm 166.033).  
• Omega No. 12 “Beads of Rice” Bracelet: Another BoR style, mentioned with 138 endpieces for a Cal. 565 De Ville.  
• Leather Straps: A standard option, paired with an Omega-signed buckle.  

The De Ville 166.033 is a popular vintage Omega, offering a blend of elegance and quality from a significant era.

• Value Factors: Condition (especially dial and unpolished case), originality of all parts, case material (solid gold highest), dial rarity (“Meister,” grey linen), and presence of an original Omega bracelet are key drivers.  
• Price Range: Stainless steel models in good condition typically range from $500-$1,200 USD. Gold-plated versions may be slightly higher. Solid gold models, particularly with rare dials or in exceptional condition, can command $1,500-$3,000+ USD.  
• The De Ville line, including the 166.033, was often positioned as a more streamlined and sometimes younger-clientele-focused alternative to the more traditional Constellation or sportier Seamaster lines, offering accessible luxury.  

• Dial: Check for sharp, even printing of all text and logos. Applied Omega logo should be well-defined. Lume (if present) should show consistent aging. “Meister” signature (if applicable) requires careful comparison with known genuine examples.  
• Case: Verify “TOOL 106” marking on Unishell case backs. Check for correct material hallmarks on gold cases. Assess for over-polishing.  
• Movement: Confirm Caliber 565 (or verify any Cal. 1001 as a late production/service replacement). Look for copper-colored plating and correct Omega engravings. Serial number should align with the late 1960s/early 1970s.  
• Crown & Crystal: Original Omega-signed crown and potentially a signed acrylic crystal are positive indicators.