9K Yellow Gold Quartz Watch Movement (Harley 375)
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 movement weight of 2 to 5 grams depending on casing components
Description
A close-up view of the interior quartz watch movement featuring a gold-toned bridge inscribed with Harley, Swiss, 375 (9K gold indicator), and six jewel bearings. The circuit board, quartz crystal oscillator, integrated circuit chip (MB101 1145Y), and battery cell are clearly visible, showcasing fine Swiss horological engineering.
Key Features
Includes a visible 375 purity stamp indicating 9K gold components within the movement bridge assembly, powered by a Swiss quartz Harley caliber with 6 jewels.
Color & Finish
Classic warm yellow gold tone with polished brass and gilt components on the movement bridge
Hallmarks & Stamps
Stamps visible on the movement bridge include 'SIX 0 JEWELS', 'UNADJ.', 'SWISS', '375', and the maker signature 'Harley'
Dimensions Estimate
Miniature watch movement typically ranging from 15mm to 25mm in diameter
Gemstones & Inlays
Six synthetic ruby jewel bearings visible on the movement bridge to reduce friction
Clasp & Closure
Press-fit or screw-secured watch case back
Chain & Links
Not applicable to this watch movement component
Craftsmanship Details
Precision-engineered Swiss quartz movement with micro-soldered electronic integrated circuits, gold-gilt bridge plates, and ruby jewel bearings.
Authentication Indicators
Clear Swiss movement stamps, legible caliber text, and official Harley maker signature confirm authenticity. Professional testing recommended for absolute metal verification.
Origin & Maker
Swiss movement manufactured by Harley (Ronda group)
Era & Period
Late 20th Century / Contemporary quartz watch era (circa 1980s-2000s)
Age Estimate
Circa 1980s to 2000s based on electronic quartz component styles
Cultural Significance
Represents the era of Swiss adaptation to quartz technology, blending traditional watchmaking terminology (jewels, unadjusted) with modern microelectronics.
Condition Notes
Good clean condition with minor dust consistent with an opened watch case. Electronic components and gold-plated bridge appear intact.
Value Estimate
Value is derived from the precious metal scrap content of the 9K gold components combined with potential horological collector value for the Swiss movement.
Care & Maintenance
Keep away from moisture and humidity. Requires professional watchmaker handling for battery replacements and movement servicing.
Similar Items
Other Swiss quartz movements by Ronda, ETA, or ISA with gold-plated or solid gold components.
Interesting Facts
Harley movements were produced by the Swiss Ronda company, known for supplying reliable quartz movements to various luxury and mid-tier watch brands during the quartz revolution.