Congress enacted the Bland-Allison Act in 1878 which required the Treasury to purchase specified amounts of silver to be made into dollar coins. George T. Morgan, assistant engraver at the U.S. Mint was tasked with designing the new coin, over 650 million of which were struck between 1878 and 1921. About half have been melted since the early 1900s, but with over 150 million stored in Treasury vaults until the 1960s a majority of the remaining examples of these beautiful coins are in mint state condition, making them the most popularly collected U.S. coin.