Seated Liberty Half Dollars are a series of silver coins struck by the United States Mint from 1839 to 1891, featuring an image of Liberty seated on a rock. The 1857 issue is notable for its historical context, as it was produced during a time of significant change in the U.S. economy and coinage system. Collectors often value these coins based on their condition, rarity, and demand among numismatists. The 50-cent denomination is significant in American coinage, representing a half dollar that has been a staple in the monetary system.