Swiss 18-Carat yellow gold open faced keyless watch Circa 1931

Gold lever watch with engraved monogram
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A fine, thin Swiss, 18K yellow gold keyless watch by Vacheron & Constantin, Genève, circa 1931. A polished, hinged gold cuvette. The back cover with engraved monogram. White enamel dial with Arabic numerals, outer minute track, subsidiary seconds. Yellow gold spade hands. A frosted gilt movement, 18 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator. Dial, case, cuvette and movement signed.
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Diameter: 49 mm
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Signed: Vacheron & Constantin  Genève