1991 United States Proof Set, 5 Coins Inside. Each set contained five coins: One example each of the Lincoln Cent, Jefferson Nickel, Roosevelt Dime (Copper-Nickel Clad), Washington Quarter (Copper-Nickel Clad), and Kennedy Half Dollar (Copper-Nickel Clad).About the sets: All coins in the 1991-S Proof Set were intended to have a Cameo or Deep Cameo Finish.Mintage: 2,610,833 setsOriginal packaging: The coins of the 1991-S Proof Set were placed in individual holes in a purple-colored, textured paper and cardboard insert, then sealed in a two-piece, clear plastic case. The case was then inserted into a protective outer cover, consisting of purple cardboard, imprinted with the somewhat confusing silver words: "United States Mint Proof Set • 1991." The new collector might ask, "Is this a Mint Set or a Proof Set?"