Swiss skeletonized US twenty dollar coin watch Circa 1980

Gold coin watch by Audemars Piguet
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A fine and rare Swiss 18 carat gold skeletonized United States of America twenty dollar coin watch, circa 1980. Finely engraved gilt finished skeletonized lever movement, 17 jewels, skeletonized dial, bezel with engraved hour markers, glazed display snap on back, all hinged within a twenty dollar coin with the head of Lady Liberty to the cover, dated 1899, the double Eagle to the reverse, the hinged cover opens by depressing a concealed thumbpiece in the coin edged band. Case and movement signed and numbered.
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Diameter: 34.8 mm
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Signed: Audemars Piguet