Swiss observatory Chronometer 1st class in original box Circa 1905

Chronometer with Geneva Observatory papers
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An 18 Carat gold numbered observatory chronometer 1^st class, with original box and Geneva Observatory papers, made by Vacheron & Constantin in the Canton of Genève, Switzerland, circa 1905. The plain full hunter (savonnette) numbered case in the shape of a waterdrop (à-goutte) was crafted from 18 Carat gold. The dust cover is engraved with Chronometer 1^st class certificate from the Observatory in Genève and the white enamel dial, with a subsidiary dial at six o’clock for the seconds, has golden Breguet hands. The numbered movement has an extremely rare and special chronometer calibre with special fine adjustment and Wolf’s teeth.
Dial, dustcover and movement signed.
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Diameter: 53 mm
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Weight: 123 g
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Signed: Vacheron & Constantin, Genève
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The watch comes with copies of the original papers from the 1905 chronometer test at the Geneva Observatory, in a probably original mahogany box with mother of pearl inlay.