Swiss chronometer for the South American market Circa 1920

Open faced lever pocket watch by Vacheron & Constantin
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A large Geneva lever chronometer for the South American market, circa 1920.
18 carat radial engine turned case; white enamel dial with Roman hours, sunk subsidiary dial for constant Arabic seconds and gold spade hands; bridge movement and gold screw compensation balance. Movement and dial signed.
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Diameter: 57 mm
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Weight: 129 g
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Signed: “Chronometre Royal” Vacheron & Constantin Genève