L. Leroy & Cie., Horlogers de la Marine, 7, Boulevard de la Madeleine, Paris, No. 2769/70078, circa 1912. Fine 18K gold keyless pocket lever chronometer. Bulletin de Premiere classe de l'Observatoire National de Besancon, No. 9288, in 1913, with a total of 142,2 marks, in original fitted leather box. | Important Watches, Wristwatches and Clocks | Geneva, Hotel Des Bergues, 12th April 1997

Important Watches, Wristwatches and C...

Geneva, Hotel Des Bergues, Apr 12, 1997

LOT 223

L. Leroy & Cie., Horlogers de la Marine, 7, Boulevard de la Madeleine, Paris, No. 2769/70078, circa 1912. Fine 18K gold keyless pocket lever chronometer. Bulletin de Premiere classe de l'Observatoire National de Besancon, No. 9288, in 1913, with a total of 142,2 marks, in original fitted leather box.

CHF 2,500 - 3,000

C. Three body, massive, "bassine", polished. Hinged gold cuvette. D. White enamel, with Arabic numerals, outer Arabic minute ring and sunk subsidiary seconds. Gold "spade" hands. M. 19"', gilt brass with punch-mark in form of a viper's head set by the Observatory of Besancon, 20 jewels, brass-invar Guillaume balance adjusted by Quelos, blued steel balance spring with terminal curve. Signed on the dial, case and movement. In very good condition, with copies of the timing certificates. Diann. 51 mm.

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Notes

Timing Contest : - Mean average daily rate = 3,54 - Error of compensation = 0,139 - Mean error of positions - 3,21 - Restart period ± 0,74 Documents kindly provided by Mrs Schmidelin, Observatoire National de Besancon. The punch mark in the form of a viper ' s head is set by the Observatory of Besancon on watches successful at the contest and awarded the Bulletin de Premiere Classe.