1998 U.S. Mint Premier Silver Proof Set This 1998 U.S. Mint Premier Silver Proof Set comes with a U.S. Mint Certificate of Authenticity and remains in the original packaging. The set consists of a Kennedy half dollar, a Washington quarter, a Roosevelt dime, a Jefferson nickel and a Lincoln cent, all marked with S for the San Francisco mint. Each coin was stuck as a proof coin. The set is contained in a metal framed display case with the great eagle seal.