Seated Liberty Half Dollars, minted from 1839 to 1891, feature a design by engraver Christian Gobrecht that depicts Liberty seated on a rock, holding a liberty pole in one hand and a shield in the other. The coins are made of 90% silver and 10% copper, with the 1845 issue being notable for its mintage and variety. Collectors often seek these coins for their historical significance, artistic design, and the variations in strike quality and condition. The 50-cent denomination reflects the value of the coin, which was widely used in commerce during its circulation period in the United States.