Large Swiss 18k gold open faced keyless lever watch Circa 1911

Gold lever by Vacheron & Constantin
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A fine and large Swiss 18 carat gold open faced keyless lever watch, circa 1911. Gilt finished fully jewelled lever movement, bimetallic compensation balance, micrometer regulator, wolf tooth’s winding. Gold cuvette. White enamel dial with Arabic numerals and subsidiary seconds. Engine turned case, the back centred by red and blue enamel initials MU. Case, cuvette, dial and movement signed, case and movement numbered.
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Diameter: 57 mm
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Signed: Vacheron & Constantin Genève Chronomètre Royal