Swiss 18k gold open faced cylinder pocket watch Circa 1860

Gold cylinder watch
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A fine and rare Swiss, 18 carat gold key wind open face pocket watch, circa 1860. Gilt finish, cylinder escapement, plain three-arm balance.
White enamel dial, black Roman numerals, black outer minute track, gilt spade hands.
Case, foliate engraved back with blue enamel decoration. Dial and movement signed.
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Diameter: 37 mm
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Signed: Mottu Geneve