Swiss 18K gold open faced Chronometre Royal Circa 1912

Gold ankerchronometer by Vacheron & Constantin
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A Swiss 18 carat gold open faced lever pocket chronometer, circa 1912. The largest and heaviest version of a Chronometre Royal. Ankerchronometer movement, fine adjusting device, wolf’s toothing. White enamel dial with Roman hours and outer minute divisions, gold hands. Case and movent signed and numbered, dial and cuvette signed. Comes with a Certificat d’Origine confirming the production of this watch in 1912.
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Diameter: 57 mm
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Weight: 135 g
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Signed: Chronometre Royal Vacheron & Constantin Genève
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The Chronometre Royale was born at Vacheron Constantin in 1907 and was an immediate success.