Rare Swiss gunmetal lever watch with six time zones Circa 1890

Open faced pocket watch
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A rare Swiss gun metal keyless wind open faced pocket watch with six time zones, circa 1890. Gilt movement with Swiss lever, cut and compensated bimetallic balance.
White enamel dial and 6 dials for timezones of New York, Petersbourg, Berlin, Paris, Londres and Constantinople, subsidiary seconds below Paris, gilt and blued steel spade hands.
Gun metal round hinged case.
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Diameter: 53 mm
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Signed: No name