2019 United State Mint American Innovation $1 Coin Proof Set. 4 Coins Inside.. United State Mint American Innovation $1 Coin Proof Set 2019 4 coins. The 2019 Set include Delaware to recognizes astronomer Annie Jump Cannon, Pennsylvania to recognizes the creation of a vaccine to prevent polio, New Jersey to honors the development of a light bulb with a filament that could last 1,200 hours, and Georgia to recognizes the Trustees’ Garden. The United States Mint American Innovation $1 Coin Program is a multi-year series featuring distinctive reverse (tails) designs that pay homage to America’s ingenuity and celebrate the pioneering efforts of individuals or groups from each of the 50 states, District of Columbia, and U.S. territories. Their frosted, sculpted foregrounds give them a special “cameo” effect. Each coin bears the “S” mint mark representing production at the United States Mint at San Francisco. Set comes in original mint packaging, including COA, a protective hard plastic case and an outer box.