Vintage Harley Ronda 375 Gold-Filled Quartz Pocket Watch
Watch (Pocket Watch) · Yellow Gold Finish. The exterior displays a classic warm yellow gold hue over a base alloy, while the interior movement components feature gold-flashed or plated surfaces.
Purity: None / Gold-Filled (Estimated). The outer case shows significant base metal exposure (brassing), indicating it is not solid gold but a gold-filled or plated base metal such as brass. Internal bridge is stamped '375', which usually signifies 9K gold, but in this quartz movement context, it refers to the caliber/series.
Type
Watch (Pocket Watch)
Purity
None / Gold-Filled (Estimated). The outer case shows significant base metal exposure (brassing), indicating it is not solid gold but a gold-filled or plated base metal such as brass. Internal bridge is stamped '375', which usually signifies 9K gold, but in this quartz movement context, it refers to the caliber/series.
Gold Type
Yellow Gold Finish. The exterior displays a classic warm yellow gold hue over a base alloy, while the interior movement components feature gold-flashed or plated surfaces.
Weight
60 - 80 grams total weight. The bulk of the weight is comprised of the base metal case, glass crystal, and internal movement; gold content is negligible (less than 0.5g).
Description
This is a vintage open-faced quartz pocket watch featuring a Swiss-made Harley (Ronda) movement. While the exterior case mimics the look of high-karat gold, the visible green corrosion and surface wear confirm it is a gold-filled base metal piece. The movement is remarkably well-preserved for its age, showcasing gold-tone plating, six functional jewels, and the transition from mechanical to electronic horology. It represents a piece of 'Quartz Revolution' history where traditional watch aesthetics met modern electronic precision.
Key Features
Distinctive 'Harley' branding on the movement bridge; 6-jewel quartz construction (high for a quartz of this era); visible copper coil for the electromagnetic pulse; '375' caliber designation which is often confused by novices for a 9K gold hallmark.
Color & Finish
The exterior has a brushed, circular graining with significant patina and green oxidation (verdigris). High-wear areas show the underlying duller base metal. The movement bridge has a bright, polished gold flash.
Hallmarks & Stamps
Internal movement movement stamped 'SIX 6 JEWELS', 'UNADJ. SWISS', '375', and 'Harley'. Case is currently missing the back cover where primary hallmarks would typically be located; movement model MB101 1145Y is visible on the chip.
Dimensions Estimate
Standard size 16 or 18 pocket watch (approx. 45-50mm diameter). Thickness approx. 10-12mm.
Gemstones & Inlays
6 synthetic ruby jewels used as bearings within the quartz movement to reduce friction in the gear train. No exterior gemstones.
Clasp & Closure
Missing case back. The item features a top-mounted bow (ring) and a fluted gold-tone winding/setting crown.
Chain & Links
Not applicable. Only the bow for a chain attachment is present. The watch is a standalone unit.
Craftsmanship Details
The movement features machine-stamped bridges with gold flashing and industrial-grade soldering on the circuit board. The case is a simple die-struck assembly. It represents efficient, mid-tier Swiss mass production.
Authentication Indicators
Red Flag: The green oxidation on the case rim is a definitive indicator of base metal (copper/brass) reacting to moisture, proving the item is not solid gold. The '375' stamp is on the movement, not the case, signifying movement caliber rather than gold fineness.
Origin & Maker
Swiss Movement (Ronda/Harley). Ronda is a major Swiss movement manufacturer. The case origin is likely European or American but lacks a specific maker's mark in this view.
Era & Period
Retro / Late 20th Century (circa 1980s). The use of a Harley (Ronda) quartz movement with integrated circuits and a battery characterizes the quartz revolution era.
Age Estimate
Circa 1980 - 1985. The Harley 375/MB101 series was a common high-quality quartz movement produced by Ronda during the early 1980s.
Cultural Significance
Reflects the 1980s era where the pocket watch form factor was kept alive as a novelty or fashion statement despite the dominance of wristwatches and the shift to electronic timekeeping.
Condition Notes
Fair to Poor. The most significant defect is the missing case back. The metal shows heavy verdigris (green oxidation) and plating loss. The movement appears clean, but the battery terminal shows signs of slight contact wear. Functional status unknown without battery testing.
Value Estimate
$15 - $40 USD. The value is purely as a parts donor or a novelty item. There is no significant precious metal melt value. Retail value is heavily diminished by the missing case back and plating damage.
Care & Maintenance
Wipe exterior with a dry soft cloth to remove corrosive oils; do not use water due to green oxidation. Remove the battery (CR or SR series) if storing for long periods to prevent acid leakage which would destroy the circuit.
Similar Items
Modern Ronda quartz pocket watches, vintage Seiko quartz pocket watches, or 19th-century 9K gold mechanical pocket watches (which would have actual 375 case hallmarks).
Interesting Facts
The 'Harley' line of movements was produced by Ronda as a premium quartz offering. Many people mistakenly believe these watches are solid 9K gold due to the '375' stamp, but in these Swiss quartz calibers, it is a model number.