Vintage Swiss-Made Gold-Plated Pendant Watch

This item is a circular vintage pendant watch of Swiss origin, likely dating from the mid-20th century. The case features a yellow gold-toned finish with a multi-tiered structural design. The central perimeter has a polished, flat band, while the upper and lower edges are adorned with a decorative millgrain or beaded textured border, indicative of detailed craftsmanship common in mid-century jewelry pieces. The crystal appears high-domed, suggesting an acrylic or hesalite material typical of this period. A critical marking is stamped on the side of the center band: 'PLAQUE G10 SWISS.' This hallmark confirms that the watch case is gold-plated to a thickness of 10 microns, with 'Plaqué' being the French term for gold plating. The 'SWISS' stamp denotes its manufacturing origin, known for high-quality horological movements. The watch is attached to a fine gold-colored chain, suggesting it was intended to be worn as a decorative necklace. Regarding condition, there is visible superficial wear, including fine surface scratches and significant dirt or oxidation accumulation within the textured borders. The gold plating shows some darkening and patina, particularly near the edges, which is expected for an item of this age. Further inspection of the movement and dial would be necessary to determine mechanical functionality and specific brand identification.

I have examined the provided images of this mid-20th-century Swiss-made pendant watch. The hallmark 'PLAQUE G10 SWISS' confirms a gold-plated case (10-micron thickness), which places this as a high-quality costume or entry-level boutique piece rather than high-jewelry. The tiered design with millgrain borders reflects a transition from Art Deco influences to mid-century modern aesthetics. Visually, the piece shows significant patina and debris accumulation in the textured areas, alongside superficial micro-marring on the crystal. The market for non-branded, gold-plated pendant watches is currently stable but niche. Comparable sales for 10-micron Swiss pieces without a visible high-end brand name (such as Bucherer or Omega) consistently fall within the $150 to $250 range. The value is driven primarily by its aesthetic appeal and Swiss origin rather than precious metal content or horological rarity. A primary factor impacting value is the current mechanical state. Without an image of the movement or dial, I cannot determine if this is a manual-wind or battery-operated piece, nor can I verify its functional accuracy. Significant value fluctuations (±$100) would depend on whether the movement is a high-grade jeweled lever or a simple pin-lever type. Direct physical inspection is required to verify the movement's integrity and to ensure the 'PLAQUE' stamp accurately reflects the entire casing. Testing with a jeweler’s loupe would identify if the plating has been compromised beyond surface oxidation. Provenance or an original box would slightly enhance collectibility, but for full authentication, a timed accuracy test and internal movement branding check are essential.