3,680 CHF
Isaac Grasset & Cie, Geneva, circa 1898. Interesting and rare silver keyless watch with special patented power source. Four-body, "bassine", polished, glazed silver cuvette. White enamel, Roman numerals, outer minute track with five-minute Arabic figures, subsidiary sunk seconds. Blued steel, "spade" hands. Notes In the early 1880's Isaac Grasset designed an interesting alternative power source in the form of a coiled spring wound around the stem (Swiss patent No. 120, later improved in No. 5019). In 1897 he patented a stem winding and setting mechanism for the arrangement, as found in this watch (Swiss patent No. 14528). He also patented an interesting constant force escapement and applied it to his design. To date, no example of this is known.
Auctioneer:
Antiquorum
Date:
2002-11-16
