The 1964 US Mint Set Uncirculated includes coins from both the Philadelphia and Denver mints, all in brilliant uncirculated condition. These silver coins, with a fineness of 0.9, have a business strike type and are certified by the U.S. Mint. This set, originating from the United States, is a valuable addition to any coin collector's portfolio, showcasing the quality and craftsmanship of American minting in 1964.