Very rare Swiss 14 carat gold lever buttonhole watch Circa 1900

Gold buttonhole watch
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A very rare Swiss buttonhole watch, circa 1900. The plain case is crafted from 14 carat gold and has a white enamel dial with Arabic hour numerals, all black but the 12 in red, and blued steel hands. To read the dial you need a magnifying glass. The movement is decorated with Geneva striping decoration and has a lever escapement.
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Diameter: 25 mm
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Weight: 16 g
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Signed: No name