The Liberty Head Double Eagle, featuring a design by Augustus Saint-Gaudens, is a $20 gold coin minted by the United States from 1849 to 1908. The 1877 edition of this coin is notable for its historical significance and gold content, weighing approximately 33.44 grams with a purity of 90%. Collectors seek this coin due to its aesthetic appeal and its representation of American prosperity during the late 19th century. As with many collectible coins, the condition and rarity significantly influence its market value.