The $20 gold piece was a coin minted in the United States from 1849 to 1933 that contains slightly less than one ounce of gold. Two versions of the $20 gold piece, which is also sometimes called the Double Eagle, were minted during its 84-year production run.
The Liberty version was the first Double Eagle design. The Double Eagle was redesigned in 1907 by Augustus Saint-Gaudens. Gaudens was commissioned by Theodore Roosevelt to do a full redesign of America's currency, and the second version of the Double Eagle became known as the Saint Gaudens Double Eagle.
The Double Eagle was decommissioned in 1933 as America moved away from the gold standard. According to the U.S. Mint, as of 2006 only 13 of the 1933-edition coins are known to exist.