Swiss gold watch set into 20 Dollar US coin dated 1900 Circa 1980

Gold coin watch by Piaget
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A very fine Swiss, 18 carat yellow gold $20 U.S. coin dated 1900 with concealed watch, circa 1980. Double case, coin opening with a concealed push piece in the band, three body hinged inner case. Satine gilt dial with painted baton indexes and blued steel baton hands. Rhodium plated movement, Geneva striping decoration, 18 jewels, straight line lever escapement, monometallic balance, self compensating flat balance spring, shock absorber, micrometre regulator. Dial, case and movement signed.
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Diameter: 35 mm
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Signed: Piaget  Swiss
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Piaget SA is a Swiss luxury watchmaker and jeweller founded in 1874 by Georges Piaget, in the village of La Côte-aux-Fées, Switzerland. The company is currently based in Geneva and is a subsidiary of the Swiss Richemont group. Piaget was initially founded as a manufacturer of watch movements but began marketing its own line of watches in the 20^th century. The company has won several awards for their designs and recently received an average environmental rating as Upper Midfield among 15 major watch manufacturers and jewellers in Switzerland by WWF. The speciality of Piaget SA is their expertise in creating luxury watches and jewellery.