1991 United States Mint Prestige Proof Set 6 Coins W/ Box & COA. Product DetailsThis wonderful seven-piece set includes all of the proof issue coins of 1991 as well as a commemorative Mount Rushmore clad half dollar and Silver dollar in the original U.S. Mint presentation case.Product Highlights: Commemorative dollar is struck in 90% Silver, with .7734 oz of actual Silver weight. Each Prestige Set will come in its original box, and may or may not include a certificate of authenticity. Set includes a proof example of the following coins: Lincoln Cent, Jefferson Nickel, Roosevelt Dime, Washington Quarter, Kennedy Half Dollar and a commemorative Mount Rushmore Silver dollar and clad half dollar. mirrorlike Proof finish adds further beauty with an impressive shine.