The 1989 United States Mint Proof Set includes a variety of denominations such as 1c, 5c, 10c, 25c, and 50c, all composed of clad material and struck as proof. Minted in San Francisco, these uncirculated coins come with a Certificate of Authenticity from the U.S. Mint. This set is a valuable addition to any coin collection, showcasing the craftsmanship and quality of American coins from 1989.