Swiss gold 10 U.S. dollar coin with concealed watch Circa 1985

Gold pendant coin watch
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A fine and rare Swiss 18 carat gold 10 U.S. dollar coin dated 1892 with a concealed watch, circa 1980s. Rhodium-plated movement, Geneva Striping decoration, 18 jewels, straight-line lever escapement, monometallic balance, self-compensating flat balance spring, shock absorber, micrometre regulator. Champagne-coloured dial with painted Roman hours and black oxidized gold baton hands. A double case, the coin is opened with a concealed push-piece in the band, a hinged inner case.  Dial signed.
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Diameter: 30 mm
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Thickness: 4 mm
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Signed: Sarcar Genève Swiss made