The Longitude at the Eve of the Third...

Geneva, Hotel Des Bergues, Oct 23, 1999

LOT 82

Auguste Berthoud, No. 171, circa 1860, Modifié et réglé par Vissière, circa 1880.Fine small, rosewood, 42 hour going marine chronometer with power reserve indicator

C. Three body rosewood box with brass corners fixings and sunk brass handles, the glazed upper section with hinged lid and brass corners. Brass bowl and gimballed suspension. D. Silvered with Roman numerals, subsidiary seconds and Up-and-Down scale. Blued steel Breguet hands. M. Spotted brass full plate with cylindrical pillars secured by screws, the back plate relieved for the barrel, fusee with chain and maintaining power, Earnshaw type spring detent escapement, two-arm balance with cylindricaweights and timing screws. Free sprung blued steel helical balance spring with terminal curves.Dial diam. 75 mm.Dim. 16,5 x 16,5 x 16,5 cm.