Swiss gold watch in US 20 Dollar gold coin dated 1875 Circa 1987

Gold skeletonized coin watch
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A rare Swiss 18K yellow gold coin purse watch set in a U.S. 20 Dollar coin dated 1875, circa 1987. Accompanied by a fitted box, certificate and guarantee booklet. Double case, straight lugs, coin opening with a push-piece concealed in the band, three-body hinged inner case. Transparent dial with gold baton hands. Skeletonised movement, hand engraved 14K gold, 18 jewels, straight-line lever escapement, adjusted for heat, cold, isochronism and five positions, monometallic balance, self-compensating flat balance spring, index regulator. Case and movement signed.
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Thickness: 5 mm
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Diameter: 35 mm
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Signed: Audemars Piguet  Swiss