Swiss silver keyless wind open faced deck watch Circa 1940

Silver open faced lever watch
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A fine Swiss, silver keyless wind open faced deck pocket watch, circa 1940. Swiss lever movement, cut and compensated bimetallic balance.
Brushed silvered dial with black Arabic numerals, black outer minute track with 5 minute markers, subsidiary seconds at 6, blued steel spade hands.
Polished hinged case. Case, dial and movement signed.
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Diameter: 60 mm
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Signed: Vacheron & Constantin