Vintage 18K Yellow Gold 25 Rubis Automatic Watch Head
Watch (Wristwatch Head) · Yellow Gold; likely a copper/silver alloy providing a rich, classic mid-century warmth.
Purity: 18K (750 fineness); contains 75% pure gold and 25% alloy metals, common for premium European vintage timepieces.
Type
Watch (Wristwatch Head)
Purity
18K (750 fineness); contains 75% pure gold and 25% alloy metals, common for premium European vintage timepieces.
Gold Type
Yellow Gold; likely a copper/silver alloy providing a rich, classic mid-century warmth.
Weight
The gold case alone is estimated between 10g and 15g, excluding the movement and crystal.
Description
A classic mid-century mechanical timepiece in a solid 18K yellow gold case. Features a sub-second complication or power reserve indicator at 12 o'clock, dauphine hands, and a mix of Arabic numerals and arrow markers.
Key Features
25-jewel automatic movement, high-gold-content 18K case, 'invisible' sub-dial at 12, and distinctive vintage downturned lugs.
Color & Finish
Deep yellow gold with high-polish finish on the bezel; lugs show significant patina and surface oxidation; dial is sunburst silver with significant scratching on the acrylic crystal.
Hallmarks & Stamps
Usually located on the case back or inside the case; internal stamps likely include '0.750' and Helvetia or female head assay marks.
Dimensions Estimate
Diameter estimated at 34mm - 36mm (excluding crown); lug width approximately 18mm.
Gemstones & Inlays
None on the exterior; interior movement contains 25 synthetic ruby jewels used for mechanical friction reduction.
Clasp & Closure
Not applicable; watch head only, requires a strap and buckle.
Chain & Links
Round case construction with downturned lugs for spring bar attachment.
Craftsmanship Details
Precision-milled solid gold case with hand-applied dial markers and a complex mechanical automatic caliber.
Authentication Indicators
Color consistency in the worn areas suggests solid gold rather than plating; '750' stamps would be the primary diagnostic found upon case-back removal.
Origin & Maker
Likely Swiss-made based on the '25 Rubis' French terminology; maker is currently obscured by crystal damage but fits the profile of brands like Longines, Omega, or Tissot secondary lines.
Era & Period
Mid-Century Modern; Late 1950s or early 1960s based on the 'Automatic' designation and 12-3-6-9 dial configuration.
Age Estimate
Circa 1955-1965.
Cultural Significance
Represents the post-war era of luxury horology where gold watches were the standard for professional milestones and retirment gifts.
Condition Notes
Fair to Poor; significant scratching on crystal, surface wear on gold lugs, missing original strap and spring bars; movement functionality unknown.
Value Estimate
Primary value is 'melt value' of the gold case (approx. $500-$800 USD) plus a movement premium if functional ($150-$300 USD extra).
Care & Maintenance
Requires professional servicing by a watchmaker; do not polish manually as it removes gold weight; replace acrylic crystal to improve legibility.
Similar Items
Vintage Omega Seamaster in 18K, Longines Conquest, or contemporary gold-plated dress watches (which are significantly lighter).
Interesting Facts
The '25 Rubis' mark indicates a high-grade automatic movement for the era, as most standard mechanicals used 17 jewels.