Swiss 18 carat gold keyless watch with six time zones Circa 1900

Gold open faced lever pocket watch 
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A fine and rare Swiss, 18 carat yellow gold, keyless pocket watch with six time zones, circa 1900. Swiss lever, cut and compensated bimetallic balance.
White enamel dial with six subsidiary time zone dials for Greenwich, Warsaw, Paris, Constantinople, Jerusalem and Berlin each with black Roman numerals, outer minute tracks and spade hands, subsidiary seconds at 6.
Polished hinged case. Signed, depose nr. 4975.
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Diameter: 50 mm
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Signed: Depose nr. 4975