Important Modern & Vintage Timepieces

Geneva, Nov 08, 2014

LOT 897

JACOB 36-HOUR DECK CHRONOMETER Jean-Aimé Jacob, à St. Nicolas, "Dépot De La Marine", No. 262. Made circa 1840. Fine and rare, mahogany-cased, 36-hour going, deck Chronometer with detent escapement and power-reserve indication.

CHF 6,000 - 9,000

HKD 50,000 - 74,000 / USD 64,000 - 9,500

Three-tier mahogany deck box, the Chronometer fixed in a brass dial plate in the middle section secured by 8 screws, brass drum housing for the movement with shuttered winding hole, glazed brass bezel with two screws in the side. 7 cm. silvered brass with radial champlevé Roman numerals, outer dot minute divisions, subsidiary seconds, up-and-down sector. Blued steel Breguet hands. 61 mm., circular gilt-brass plates pinned to cylindrical pillars, fusee and chain with Harrison's maintain power, 18,000 count train, Earnshaw's Chronometer escapement on a further plate on the backplate, spring footed-detent, jeweled locking stone, bimetallic compensation balance with 2 cylindrical weights and meantime and temperature adjustment screws, free-sprung blued steel helical balance spring with inner and outer terminal curves, diamond endstone.


LOADING IMAGES
Click to full view
Image
Grading System
Grade: AA

Very good
Case: 3

Good
Movement: 2*

Very good

Overhaul recommended, at buyer's expense
Dial: 3-01

Good

HANDS Original

Notes

Dial signed. DIM. 10 x 12.5 x 7 cm. JEAN-AIMÉ JACOB was born in 1793 and died in 1871. He was evidently a maker of repute being listed for chronometers, regulators and astronomic clocks. Silver medal in 1844. In 1856 he exhibited in Rouen an astronomic clock.