Danish gold watch set in U.S. 20 dollar coin dated 1875 Circa 1975

Gold lever coin watch by Jurgensen
–
A very fine, thin Danish 18K yellow gold lever watch set into a U.S. 20 dollar coin dated 1875, circa 1975. Rhodium-plated movement, Geneva striping decoration, straight-line lever escapement, monometallic balance adjusted in five positions, self-compensating flat balance spring, index regulator. Gold dial with a Roman numeral at 12 o’clock, original gold hands. Double case, coin opening with a push-piece concealed in the band, three-body hinged inner case. The dial is signed.
–
Diameter: 35 mm
–
Thickness: 4 mm
–
Signed: Urban Jurgensen & Sonner  Copenhagen