The Longitude at the Eve of the Third...

Geneva, Hotel Des Bergues, Oct 23, 1999

LOT 69

L. Leroy & Cie., Horlogers de la Marine,7 Boulevard de la Madeleine, Paris, No. 2931, sold to Marquise de Flers in 1914.Fine 18K gold keyless pocket lever chronometer. Bulletin de Première classe de l'Observatoire National de Besançon No. 9234, in 1913, was awarded the Gold Medal with a total of 236 marks, in original fitted leather box.

CHF 5,000 - 6,000

Sold: CHF 5,750

C. Three body, massive, "bassine", polished. Hinged gold cuvette engraved with the awarded prize. D. Two tone white enamel, with Roman numerals, outer minute ring and sunk subsidiary seconds. Blued steel "spade" hands. M. 19''', gilt brass with punch-mark in form of a viper's head set by the Observatory of Besançon, 20 jewels, straight line lever escapement, brass-invar Guillaume balance adjusted by Grogg, blued steel balance spring with terminal curve.Signed on the dial, case and movement.Accompanied by copies of the timing certificates and by a letter from Maison Leroy.Diam. 53 mm.


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Grading System
Grade: AAA

Excellent
Case: 3

Good
Movement: * 3
Dial: 3 - 01

Notes

Timing Contest:- Mean average daily rate 2.52- Error of compensation at 20° - 0.044- Mean error in 2 positions - 0.29- Restart period + 0.40The punch mark in form of a viper's head is set by the Observatory of Besançon on watches successful at the contest and awarded the Bulletin de Première classe.With a total of 236 marks, this chronometer was among the best ever tested in The Observatory of Besançon; it was awarded the Gold Medal and missed the Cup, the highest distinction for less than fourteen marks.