Unusual Swiss silver pocket watch with six time zones Circa 1900

Sterling silver open faced lever
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A rare and unusual Swiss, sterling silver keyless pocket watch with six time zones, circa 1900. Lever escapement. White enamel dial with six subsidiary time zone dials for Paris, Rome, New York, London, Pekin and St. Petersburg each with black Roman numerals, outer minute tracks and spade hands, and subsidiary seconds at 6. Dial signed and case numbered.
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Diameter: 51 mm
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Signed: Depose nr. 4975  Swiss made