The coin referred to is a United States Liberty Head Double Eagle, specifically the twenty-dollar denomination minted in 1871. These coins feature a prominent depiction of Lady Liberty on the obverse and an eagle with a shield on the reverse. The Liberty Head design was used from 1849 until 1907 and is sought after by collectors for its historical significance and gold content. The 1871 Double Eagle has a limited mintage, contributing to its desirability in the numismatic market.