Swiss remarkable small pocket watch in a gold coin Circa 1973

Hunting cased pocket watch by Omega Watch Co.
–
A remarkable, Swiss small pocket watch in a 20 dollar gold coin, circa 1973.
The front shows the Eagle of the United States; the coin is inscribed with “United States Of America“, In God We Trust” and the value of the coin “Twenty Dollars“. The back shows the symbol “Lady Liberty” with inscription “Liberty, 1924“.
18 carat gold case with a chased front and back side; gilt dial with Roman numerals, signed “Swiss made” and “Omega”; divided 3/4 plate movement, signed,  pink gilt and a Glucydur screw balance.
–
Diameter: 35 mm
–
Weight: 36 g
–
Signed: Omega, Swiss made