Vintage Omega Seamaster Calendar 18K Yellow Gold Automatic Watch
Watch (Wristwatch, Dress Watch) · Yellow Gold. The item displays a classic, deep warm tone characteristic of mid-century high-karat Swiss gold alloys.
Purity: 18K (750/1000) Gold. This means the case and likely the bracelet are composed of 75% pure gold alloyed with silver and copper for durability.
Type
Watch (Wristwatch, Dress Watch)
Purity
18K (750/1000) Gold. This means the case and likely the bracelet are composed of 75% pure gold alloyed with silver and copper for durability.
Gold Type
Yellow Gold. The item displays a classic, deep warm tone characteristic of mid-century high-karat Swiss gold alloys.
Weight
Total weight approximately 85-110 grams. The head of the watch contains roughly 15-20g of 18K gold; the solid gold beads-of-rice bracelet adds significant weight.
Description
A stunning example of mid-century Swiss horology, this 18K solid gold Omega Seamaster Calendar represents the pinnacle of executive dress watches from the era. Featuring a rare 'Calendar' complication at 6 o'clock and a matching solid gold beads-of-rice bracelet, it exudes a sophisticated 'Quiet Luxury' aesthetic that is highly sought after by vintage watch collectors.
Key Features
Solid 18K gold construction (case and bracelet), 6 o'clock date window, applied dagger/arrow markers, and the iconic Omega automatic movement.
Color & Finish
Rich yellow gold with mixed finishes. The bezel and lugs are high-polish, while the case body might feature satin brushing. The bracelet shows a high-gloss finish on the 'beads' with visible surface patina from age.
Hallmarks & Stamps
Expect a '750' purity stamp and Swiss Helvetia hallmark inside the caseback. The bracelet clasp should bear Omega's logo and a gold hallmark. The dial is printed 'OMEGA AUTOMATIC SEAMASTER CALENDAR'.
Dimensions Estimate
Case diameter 34-36mm (excluding crown); lug width 18mm; bracelet length standard 7-8 inches; thickness approximately 11mm.
Gemstones & Inlays
None. The dial features applied gold arrow-head hour markers and a gold Omega logo. Luminous material probably tritium or radium depending on precise year.
Clasp & Closure
Fold-over deployment clasp integrated into the gold beads-of-rice bracelet, featuring an embossed Omega logo.
Chain & Links
Beads-of-Rice (BoR) style multi-link gold bracelet. Known for its high flexibility, comfort, and luxurious fluid drape on the wrist.
Craftsmanship Details
Hand-finished case with sharp chamfers on lugs; high-precision Swiss mechanical movement with 'perlage' finishing; intricate multi-link hand-assembled gold bracelet.
Authentication Indicators
Correct font serif on dial, applied gold logo, sharp hallmark stamping (if opened), and the characteristic weight of solid 18K versus gold-plate. Red flag check: Ensure the crown is signed with the Omega logo.
Origin & Maker
Switzerland; manufactured by Omega SA. A prestigious brand known for precision and historical significance in diving and space exploration.
Era & Period
Mid-Century Modern (Late 1950s - Early 1960s). Indicated by the 'Seamaster Calendar' script, arrow-head markers, and 6 o'clock date window placement.
Age Estimate
Circa 1956-1962. The 'Calendar' at 6 o'clock and the lug design are typical for Omega movements of the 500-series caliber from this range.
Cultural Significance
Represents the post-war boom and the rise of the 'Gentleman's Sport Watch'—a timepiece capable of being worn in a corporate boardroom or a country club.
Condition Notes
Good to Very Good vintage condition. Visible scratches and small dings on the gold bezel and lugs. The dial shows 'stardust' spotting/patina consistent with age. Bracelet links show slight stretching.
Value Estimate
Market value between $6,000 - $9,500 USD depending on movement condition and bracelet weight. Melt value estimated at $4,000-$5,000; the remainder is collector's premium.
Care & Maintenance
Avoid all water exposure despite 'Seamaster' name (gaskets degrade over time). Clean gold with a soft cloth only. Professional movement service every 5-7 years is essential.
Similar Items
Vintage Rolex Oyster Perpetual (14k/18k), Patek Philippe Calatrava, or the Omega Constellation Pie-Pan in 18K gold.
Interesting Facts
The Seamaster line was originally inspired by water-resistant watches supplied to the British military during WWII. Solid gold versions on bracelets are significantly rarer than steel versions.