1991 United States Mint Prestige Proof Set. 1991 Prestige Sets consist of proof version coins of the five U.S. circulating coins, along with commemoratives from the year of issue. As they are made specifically for collectors, Prestige Sets are highly valued for their beauty and rarity. Each Prestige Set comes with a certificate of authenticity and is encased in a stunning holder. This beautiful album opens like a book to handsomely display the eye-catching allure of each coin. This set includes 7 coins: * (1) Lincoln cent * (1) Jefferson nickel * (1) Roosevelt dime * (1) Washington quarter * (1) Kennedy half-dollar * (1) Half-dollar Mount Rushmore (1) Silver Dollar Mount Rushmore Commemorative struck in 90% silver. All coins were struck at the San Francisco Mint.