L. Leroy & Cie., Horlogers de la Marine, 7 Bd. de La Madeleine, Paris, No. 9417, circa 1920. Very fine 18K gold, keyless pocked lever chronometer with chronograph and instantaneous 60-minute recorder. Bulletin de Premiere classe de l'Observatoire National de Besancon, No. 12575, in 1920 with a total of 161 marks. | 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 224

L. Leroy & Cie., Horlogers de la Marine, 7 Bd. de La Madeleine, Paris, No. 9417, circa 1920. Very fine 18K gold, keyless pocked lever chronometer with chronograph and instantaneous 60-minute recorder. Bulletin de Premiere classe de l'Observatoire National de Besancon, No. 12575, in 1920 with a total of 161 marks.

CHF 5,000 - 6,000

C. Three body, massive, "bassine", polished". Hinged gold cuvette. D. White enamel with Arabic numerals, outer minute and chronograph rings, sunk subsidiary seconds and minute register. Gold "pear " hands. M. 18"', gilt brass with punch-mark in form of a viper ' s head set by the Observatory of Besancon, 24 jewels, straight line lever escapement, brass-invar Guillaume balance adjusted by Jaccard, balance spring with Breguet terminal curve. Chronograph with visible work and button on the winding crown. Signed on the dial, case and movement. In very good condition with copies of the timing certificate. Diam. 52 mm.

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Notes

Timing Contest : - Mean average daily rate = 3,48 - Error of compensation = 0,193 - Mean error of positions - 0,82 - Restart period ± 0,36 Documents kindly provided by Mrs Schinidelin, 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.