Berthout. A rare and important 18K gold quarter repeating semi-marine openface pocket chronometer
Berthout. A rare and important 18K gold quarter repeating semi-marine openface pocket chronometer

SIGNED LS BERTHOUT, HORLOGER DE LA MARINE, NO. 2577, CIRCA 1808

Details
Berthout. A rare and important 18K gold quarter repeating semi-marine openface pocket chronometer
Signed Ls Berthout, Horloger de la Marine, No. 2577, circa 1808
With gilt-finished chain fusée movement, pivoted detent escapement, Berthout cut bimetallic three arm balance with compensation weights, blued steel cylindral spring with diamond endstone, quarter repeating on two hammers on two blocks in the case, the white enamel dial with Arabic numerals, blued steel moon-style hands, subsidiary seconds, in plain case, repeating through the pendant, pendant locked by a sliding lever in the band, gimballed in original two-tier mahogany observation box, dial and movement signed
61 mm. diam.
Literature
For detailed descriptions and illustrations of this particular watch see Longitude at sea in the time of Louis Berthout and Henri Motel by Jean-Claude Sabrier, pages 80-82, 184, 195 pl. 77, 243 and 415.

Lot Essay

Pierre Louis Berthout, known as Louis Berthout, was born in November 1754 in Plancemont, a little village in the canton of Neuchâtel, Switzerland. At the age of twelve he started his apprenticeship in the workshop of his father Pierre Berthout, counsellor and master clock-maker at Couvet. His uncle, the famous Louis Berthout, noticed his exceptional skills, and invited him to Paris to complete his training and to be initiated into precision clockmaking.
In June 1784 Louis Berthout became 'Elève Horloger Méchanicien de la Marine' with a salary of 1,000 livres per year and in 1786, he made a portable longitude watch for which he earned an honourable mention and a price of 6,000 livres from the Ministry of the Interior.
As of 1802, he became Watchmaker-Mechanic for the Navy and in July 1805, the Office of Longitute granted him the title of Watchmaker of the Observatory and Office of Longitudes.

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