The Longitude at the Eve of the Third...

Geneva, Hotel Des Bergues, Oct 23, 1999

LOT 37

O. Dumas, Successeur de Gannery, No. 126, circa 1851.Very fine and rare magogany eight day going marine chronometer.

CHF 20,000 - 24,000

C. Three body mahogany with external brass handles, glazed upper section, the hinged lid with brass corners. Brass bowl and gimballed suspension.D. Frosted and silvered with Roman numerals, subsidiary seconds and Up-and-Down scale. Blued steel Breguet hands. M. Brass three-quarter plate with with main frame and sub-frame, conical pillars, fusee with chain and maintaining power, spring detent escapement, entirely fitted including the balance on a spotted finished platform, two-arm compensation balance with cylindrical weights and timing screws, free sprung blued steel helical balance spring with terminal curves.Signed on the dial and back plate.Dial diam. 110 mmDim. 18 x 17,5 x 17,5 cm.


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Grading System
Grade: AAA

Excellent
Case: 4

Fair
Movement: * 4 - 5
Dial: 4 - 5 - 01

Notes

According to the serial number, this chronometer is certainly one of the first produced by Onésime Dumas as the successor of Gannery.As opposed to eight day going marine chronometer movements produced in England with a large frame for the fusee and barrel and a small sub-frame for the escapement, this chronometer is remarkable by the escapement which is mounted on the platform of the sub-frame, almost isolated from the rest of the movement and, like on Breguet chronometers, can be removed as easily as the platform escapement of a carriage clock.