This 1991 United States Mint Proof Set includes five coins and a Certificate of Authenticity. The coins are uncirculated and struck in proof quality at the San Francisco mint. The set includes 50c, 25c, 10c, 5c, and 1c denominations, all minted in 1991. The set is a great addition to any coin collection and is certified by the United States Mint. This set is perfect for anyone who loves collecting coins and wants to add a piece of American history to their collection.