Rare swiss gold coin watch by Patek Philippe Circa 1959

Rare yellow gold coin watch
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A rare swiss yellow gold coin watch, circa 1959, cal. 99P manual winding nickel lever movement, 17 jewels, mono-metallic balance.
Gilt dial, baton indexes, blued steel hands, 18k yellow gold circular case concealed under a hinged 18k yellow gold United States of America Twenty Dollars coin with the head of Lady Liberty dated 1900 and the bald eagle to the reverse, case, dial and movement signed.
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Diameter: 34 mm
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Signed: Patek Philippe