Harley Quartz Watch Movement in Solid Gold Case
Watch · Yellow Gold
Purity: 9K (375 fineness, approximately 37.5% pure gold)
Type
Watch
Purity
9K (375 fineness, approximately 37.5% pure gold)
Gold Type
Yellow Gold
Weight
Estimated total watch weight 25-40 grams, gold case portion likely 10-15 grams depending on thickness
Description
A close-up view of the interior of a fine gold wristwatch, displaying a Swiss quartz movement signed by Harley. The movement features prominent gold-toned plating, visible ruby jewel bearings, an electronic integrated circuit labeled MB101 1145Y, a quartz timing crystal, and a coin cell battery. The gold casing surrounding the movement bears the '375' hallmark indicating 9-karat solid gold, blending precision Swiss horology with precious metal craftsmanship.
Key Features
Swiss-made Harley quartz movement, 0-jewel unadjusted configuration, integrated electronic circuit components, and a verified 9K solid gold casing indicated by the 375 hallmark stamp directly on the movement bridge.
Color & Finish
Classic warm yellow gold with a high polish finish on the exterior case elements visible around the periphery
Hallmarks & Stamps
Visible movement engravings state 'SIX 0 JEWELS', 'UNADJ.', 'SWISS', '375', and the maker's signature 'Harley'. The '375' stamp indicates 9K British/European gold standard
Dimensions Estimate
Standard dress watch movement size, approximately 20mm to 25mm in diameter
Gemstones & Inlays
Contains 0 jewels (synthetic ruby bearing jewels as part of the Swiss quartz movement assembly)
Clasp & Closure
Press-fit or threaded watch case back housing the quartz movement
Chain & Links
Not applicable; standalone watch case and movement assembly
Craftsmanship Details
Precision Swiss micro-engineering featuring gold-plated movement bridges, micro-screws, a quartz oscillator crystal, and fine electrical soldering on the integrated circuit.
Authentication Indicators
The presence of standard Swiss movement markings ('SWISS', 'UNADJ'), the official Harley script logo, and the explicit '375' gold fineness stamp serve as strong indicators of authenticity.
Origin & Maker
Movement manufactured by Harley (Ronda / Harley Ronda SA) in Switzerland
Era & Period
Late 20th Century to Contemporary (circa 1980s-2000s)
Age Estimate
Circa 1980s to 2000s based on quartz circuit board and movement style
Cultural Significance
Represents the fusion of traditional precious metal jewelry crafting with modern electronic quartz technology that revolutionized the watchmaking industry in the late 20th century.
Condition Notes
Very Good vintage condition. Movement components are clean with no obvious corrosion or battery leakage. Screw heads are intact, and circuit board traces appear pristine.
Value Estimate
Value is derived from a combination of the melt value of the 9K gold case and the collector value of the Swiss quartz watch assembly, typically ranging from $150 to $400 depending on the complete watch brand and overall condition.
Care & Maintenance
Keep away from moisture and extreme magnetic fields. Replace the silver-oxide battery promptly upon depletion to prevent leakage damage to the electronic circuit board and gold case interior.
Similar Items
Other Swiss quartz movements by Ronda, ETA, or ISA housed in 9K, 14K, or 18K gold cases by various European watchmakers.
Interesting Facts
Harley movements were produced by the Swiss watch component manufacturer Ronda, widely used in various European and Swiss watch brands during the quartz crisis and post-crisis era to provide reliable quartz timekeeping.