Piguet & Co & Gen(ve Vintage Key-Wind Pocket Watch with R&aumur Thermometer

This is a rare 19th-century Swiss pocket watch featuring a white enamel dial with black Breguet-style numeral hour markers and an outer minute track. The dial is signed 'Piguet & Co & Gen(ve' in an elegant cursive script. A unique and highly distinguishing feature is the integrated R&aumur scale thermometer positioned at the 12 o'clock sub-dial, labeled 'REAUMUR'. This thermal gauge employs a bimetallic strip visible through a central aperture, though the indicator needle appears absent or damaged. The watch is housed in a polished silver-tone case, likely sterling silver or coin silver, displaying a characteristic aged patina and moderate surface oxidation. It is a key-wind and key-set movement, as evidenced by the accompanying metal winding key. The blued steel hands show some surface oxidation but remain largely intact. The bezel is fitted with a low-dome crystal that appears to have minor surface scratches. Overall, the piece represents high-quality Swiss horological craftsmanship from the mid-to-late 1800s, combining timekeeping with scientific instrumentation. The condition shows visible wear consistent with age, specifically to the thermometer complication and the exterior metal finish, which would benefit from professional conservation.

I have examined the Piguet & Co à Genève pocket watch via high-resolution imagery. This 19th-century Swiss timepiece is a significant horological specimen due to the integration of a Réaumur thermometer, a rare complication usually reserved for high-grade scientific or 'doctor' watches. The dial remains in excellent condition with no visible hairlines, and the signature remains crisp. However, the absence of the thermometer gauge needle and the heavy oxidation on the silver case significantly impact the current valuation. While the movement is a high-quality key-wind caliber, these condition issues necessitate professional restoration to achieve top-tier market pricing. Similar complications by Genève houses like Piguet often realize premiums at auction due to the bimetallic strip complexity. The current market for unusual 19th-century complications remains stable, though buyers are increasingly condition-sensitive. Please note that this appraisal is based on visual evidence; full authentication requires a physical inspection to verify the hallmarks on the case interior, the integrity of the gear train, and the presence of original movement components. I cannot definitively confirm if the movement is functional or if the thermometer strip retains its elasticity without bench testing. Documentation of provenance or a movement serial number would further refine this valuation.