Since its introduction in 1850, the coin was produced in three types: Type I, the "No Motto" variety, was minted from 1849 to 1866. Type II, which had the designation "Twenty D" on its reverse, was minted from 1866 to 1876. This was followed in 1877 by the introduction of the, Type III with "Twenty Dollars" fully spelled out, which became the most common variety as it was minted over the next thirty years. The Liberty Double Eagle features the highest gold content of any regular issue U.S. gold coin of its time. Liberty appears on the obverse, while the reverse depicts a magnificent eagle, with wings fully spread.