25,000 CHF
TAVAN - IMPORTANT SILVER PORTABLE ONE-DAY MARINE CHRONOMETER WITH SPECIAL CONSTANT FORCE ESCAPEMENT INVENTED BY TAVAN Antoine Tavan, à Geneve, Invenit & Fecit. Made for marine navigation, circa 1819. Very fine, extremely rare and important, large, silver-cased by Amy Gros, 1-day going portable precision Chronometer marine timekeeper with 'OZ' type balance, constant force escapement of unusual construction with remontoire and stop feature for exact setting. Probably the marine timekeeper by Tavan with constant force escapement which achieved First Prize at the Concours de Chronométrie de L'Observatoire de Genève in 1819. Three-body, silver, 'bassine et collier' by Amy Gros with deep back, tapered band, ball-form pendant with circular bow, hinged back with shuttered winding aperture. Gilt- brass dust ring secured by three screws, hinged cuvette fixed to the dust ring. White enamel, radial Roman numerals, outer minute divisions with Arabic five-minute numerals, large subsidiary seconds with Arabic five-second numerals. Fine gold beetle and poker hands. 68 mm., matte gilt, full plate, cylindrical pillars with flared ends, fusee and chain with Harrison's maintaining power, steel stopwork on the dial plate, jeweled Chronometer escapement mounted on a separate subsidiary plate within the movement, with steel escape wheel, the upper pivot jewels with polished steel plates, pivoted anchor with jeweled entry pallets, the fork at the opposing end engaging with the locking jewe
Auctioneer:
Antiquorum
Date:
2013-11-10
