Swiss gold watch set in US 20 Dollar gold coin dated 1908 Circa 1968

Gold lever coin watch by Patek Philippe
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A very fine and rare Swiss, extra thin 18K yellow gold, keyless coin watch set into a 20 U.S. Dollar coin dated 1908, circa 1968. Accompanied by the Extract from the Archives. The hinged watch within the coin opened by a push-piece concealed in the band, in the front the profile of Lady Liberty and on the back the American Eagle.  Champagne dial with painted black baton indexes. Blued steel baton hands. Movement stamped with the Seal of Geneva quality mark, rhodium-plated, Geneva striping decoration,18 jewels, straight-line lever escapement, Gyromax balance adjusted to heat, cold, isochronism and five positions, shock absorber, self-compensating free-sprung flat balance spring. Dial and movement signed, case numbered.
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Diameter: 36 mm
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Signed: Patek Philippe  Genève