This lot includes three U.S. Mint proof sets from 1968, 1969, and 1970. The sets come in their original government packaging but do not include the certification card. Each set contains coins in an uncirculated condition and was struck at the San Francisco Mint. The sets are a great addition to any coin collection and are a testament to the quality of U.S. Mint craftsmanship. Two of the boxes show signs of wear, one is in mint condition. The Kennedy halves are 40% silver.