Vintage 10K Yellow Gold-Filled Rio 15 Rubis Cocktail Watch
Cocktail Watch / Ladies Wristwatch · Yellow Gold alloy with a warm, slightly brassy tone characteristic of mid-century gold-filled items with copper/silver alloys.
Purity: Likely 10K Gold-Filled (RGP/GF); this is a thick layer of gold mechanically bonded to a base metal, typically 1/20th of the total weight in gold content.
Type
Cocktail Watch / Ladies Wristwatch
Purity
Likely 10K Gold-Filled (RGP/GF); this is a thick layer of gold mechanically bonded to a base metal, typically 1/20th of the total weight in gold content.
Gold Type
Yellow Gold alloy with a warm, slightly brassy tone characteristic of mid-century gold-filled items with copper/silver alloys.
Weight
Complete item approximately 12.0 - 15.0 grams including movement; the gold content is nominal due to being a filled case.
Description
An elegant mid-century ladies' cocktail watch featuring a square gold-filled case. The design is defined by dramatic, tiered, fan-like lugs that provide a sculptural transition to the black textile cord strap. The dial possesses a refined vertical brushing and classic numismatic typography.
Key Features
Triple-gadroon decorative lugs; 15-jewel manual wind movement; original cord-style attachment points; '15 Rubis' technical designation on dial.
Color & Finish
Yellow gold with a high-polish finish on the case and gadroon-style decorative lugs; visible patina and brassing (wear-through) on the edges of the lugs and crown.
Hallmarks & Stamps
The dial is stamped 'RIO' and '15 RUBIS'. The interior or exterior case back likely contains '10K GOLD FILLED' or '10K RGP', though not visible in the photo.
Dimensions Estimate
Case diameter approx. 14mm - 16mm (excluding crown); lug-to-lug length approx. 28mm; petite vintage cocktail proportions.
Gemstones & Inlays
15 internal synthetic rubies used as functional movement bearings; no external gemstones. Dial features printed Arabic numerals.
Clasp & Closure
Connected to a black cord strap; likely features a folding center-catch clasp or a security safety chain in base metal or gold plate.
Chain & Links
Black nylon or silk cord strap with metal end-caps, common for 1940s-50s cocktail watches to emphasize the gold case.
Craftsmanship Details
Features a die-struck case with hand-applied finishing. The movement is a mechanical caliber requiring manual winding, representing the era's standard precision engineering.
Authentication Indicators
The 'Rubis' spelling suggests European movement origins; the wear pattern confirms gold-filled construction rather than solid gold; hallmark placement for these is traditionally the inner case back.
Origin & Maker
Likely Swiss movement (indicated by 'Rubis' French terminology) housed in a domestic U.S. or European case. 'Rio' was a smaller boutique brand or model line.
Era & Period
Late Art Deco to Retro Era transition; mid-century (circa 1940-1955) based on the bold gadrooned lugs and cord strap style.
Age Estimate
Circa 1945–1952. The stylistic lugs and 15-jewel movement are typical of post-WWII feminine horology.
Cultural Significance
Represented the shift from utilitarian wartime timepieces to delicate, jewelry-inspired 'cocktail' accessories intended for social evening wear.
Condition Notes
Fair-to-Good condition. Visible oxidation on the dial (spotting/foxing); moderate wear-to-base-metal (brassing) on high-friction areas of the lugs; crystal shows light scratching; movement functionality unknown.
Value Estimate
$25 - $75 USD. Value is primarily as a vintage accessory/collectible rather than precious metal content, as the gold-filled weight is negligible.
Care & Maintenance
Avoid all water exposure (the case is not waterproof); do not overwind the crown; clean the case only with a dry microfiber cloth—using polish may remove more of the gold layer.
Similar Items
Vintage Hamilton, Bulova, or Elgin ladies' cord watches. Solid 14K versions of these models are heavier and lack the 'brassing' seen on the edges of this piece.
Interesting Facts
The term 'Rubis' refers to the 15 synthetic rubies used to reduce friction in the gear train; higher jewel counts generally indicated a more precise and durable movement.