Fine Swiss 18 carat yellow gold lever dress watch Circa 1912

Swiss open faced pocket watch
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A fine, keyless, 18 Carat yellow gold Swiss dress watch by Vacheron & Constantin, Genève, circa 1912. Demi bassine, solid, polished, hinged gold cuvette. White enamel dial with bold Roman numerals, subsidiary seconds. Yellow gold spade hands. A frosted gilt movement, 19 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, swan-neck micrometre regulator. Dial, case and movement signed.
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Diameter: 49 mm
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Signed: Vacheron & Constantin, Genève