Swiss 18K yellow gold keyless dress watch Circa 1913

Gold open faced lever by Vacheron & Constantin 
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An elegant Swiss 18K yellow gold keyless dress watch, circa 1913. A polished case, demi-concealed hinged gold cuvette. Silver dial with champleve Breguet numerals, outer minute track, guilloché outer and inner field, subsidiary seconds and blued steel feuille hands. A matte gilt movement, 17 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel flat balance spring, and an index regulator. Dial, case, cuvette and movement signed.
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Diameter: 46.5 mm
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Signed: Vacheron & Constantin  Genève