Sold for:
23,000 CHF

Vacheron & Constantin, Genève, “Chronomètre”, No. 400726, case No. 250472. Made in 1931. Very fine and extremely rare, keyless, slim silver pocket lever chronometer with split-seconds chronograph, instantaneous 30-minute register and Guillaume balance. Awarded a “Bulletin de Première Classe pour pièces compliquées” from the Geneva Observatory in 1932, adjusted by master adjuster Edmond Olivier. Accompanied by a Certificate of Authenticity and a copy of the Observatory certificate. White enamel with upright Arabic numerals,outer minute track with five-seconds/minute Arabic markers, outermost fifth second timing scale, sunksubsidiary seconds, 30-minute register at 12. Blued steel Breguet hands. Cal. 19/20’’’ P.C.A.B., 48/12, rhodiumplated, "fausses côtes" decoration, 27 jewels, straight line lever escapement, Guillaume balance with gold timingscrews, blued steel Breguet balance spring with double overcoil, Vacheron & Constantin micrometer regulator(Patent CH 101652, registered 1 November 1923).Dial, case and movement signed.Diam. 51 mm. Notes The Observatory Certificat records the follwing results: compensation error by degree: 0.017; change of rate with change of position: -0,40. The more complicated a timepiece is, the more difficult it is to adjust, particularly as concerns complications such as a chronograph, split-seconds function, and/or a register. The additional wheelwork affects the timepiece's functioning, because of the amount of energy required - but often


Antiquorum

Auctioneer:
Antiquorum

Date:
2005-04-03

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