The 1960 U.S. Mint Proof Set Lot #621 features coins made of silver, struck in proof quality, and certified by the U.S. Mint. This set includes coins from the United States, specifically from the year 1960. These coins are highly sought after by collectors for their excellent condition and historical significance. This set is a valuable addition to any coin collection, showcasing the finest craftsmanship of the U.S. Mint in the early 1960s.