AI Appraisal Estimate

This is a mid-20th century Omega Cosmic triple calendar moonphase wristwatch, likely featuring a 14k or 18k yellow gold-filled or solid gold case. The watch has a light champagne or silvered dial that exhibits significant age-related patina and spotting. A key distinguishing feature is the 'Tiffany & Co.' co-branding below the Omega logo, indicating it was originally sold through the prestigious New York retailer. The dial displays dual apertures for the day and month, a center date hand pointing to an outer numeric track, and a moonphase complication integrated into the small seconds sub-dial at 6 o'clock. The hands include the classic dauphine style for hours and minutes and a blued-steel moonphase indicator. The condition shows heavy wear, with visible scratches on the acrylic crystal and substantial surface abrasions on the gold case and lugs. It is fitted with an aftermarket Speidel-style expandable metal bracelet, which is not original to the piece. This model typically dates to the late 1940s or early 1950s and is highly sought after by collectors for its complex mechanical movement and rare retailer signature.

I have completed a visual examination of this mid-20th century Omega Cosmic Triple Calendar Moonphase. The standout feature is the Tiffany & Co. retailer signature, which significantly elevates its desirability among horological collectors. The watch exhibits a genuine 'honest' patina; the spotting on the dial suggests original finish rather than a later restoration, which preserves its historical integrity. The movement is likely the Caliber 27 DL PC, a masterpiece of 1940s-50s engineering. However, the condition is fair to good; the significant surface abrasions on the case and the presence of a non-original Speidel-style expandable bracelet detract from the overall value. The market for 'signed' vintage Omegas remains strong, with Tiffany-stamped examples commanding a 30-50% premium over standard models. While the aesthetics show heavy wear, the mechanical complexity of the moonphase and triple date complications maintains a high price floor. Limitations: This appraisal is based solely on visual inspection. A physical examination is required to confirm the movement's serial number for date matching, check for gold purity (14k vs 18k solid gold vs gold-filled), and ensure the Tiffany & Co. stamping is period-correct and not a later addition. I recommend a professional service record and potential verification from the Omega Archives to maximize its auction potential. For full authentication, I would need to inspect the inner case back markings and evaluate the movement's functionality and lubrication state.