Swiss gold keyless wind open faced lever watch Circa 1940

A Swiss gold keyless wind pocket watch by Vacheron & Constantin, circa 1940. Swiss lever movement, cut and compensated bimetallic balance. White enamel dial, black Arabic numerals, black outer minute track, gilt spade hands and subsidiary seconds at 6. 14 Carat open face case, polished hinged, personal engraving to inside case. Signed cuvette.
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Diameter: 48 mm
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Signed: Vacheron & Constantin