1988 United States Mint Prestige Proof Set 6 Coins W/ Box & COA. Product DetailsThis wonderful six-piece set includes all of the proof issue coins of 1988 as well as a commemorative Seoul Olympics proof Silver dollar in the original U.S. Mint presentation case.Product Highlights: Commemorative dollar is struck in 90% Silver, with .7734 oz actual Silver weight. Set includes a proof example of the following coins: Lincoln Cent, Jefferson Nickel, Roosevelt Dime, Washington Quarter, Kennedy Half Dollar, and a commemorative Seoul Olympics Silver dollar. mirrorlike Proof finish adds further beauty with an impressive shine. Each Prestige Set will come in its original box, and may or may not include a certificate of authenticity.