Swiss gold watch set in U.S. 20 dollar coin dated 1903 Circa 1980

Gold lever coin watch by Piaget
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A very fine Swiss 18 carat yellow gold $20 U.S. coin dated 1903 with concealed watch, circa 1980. Double case, coin opening with a concealed push-piece in the band, three-body hinged inner case. Satiné champagne 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. Dial, case and movement signed.
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Diameter: 35 mm
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Thickness: 4 mm
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Signed: Piaget  Swiss
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Accompanied by a pouch
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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. They are particularly known for their ultra-thin watches, which have set numerous records for their slimness. Piaget also creates stunning jewellery pieces, often incorporating precious stones and innovative designs. The thinnest tourbillon movement in the world is the Calibre 600P, developed by Piaget. It has a thickness of 3.5 mm.