United States Mint Proof Sets. PCS Stamps & Coins “America’s Finest Coinage”. Wood Display Case Box with Key. The collection of proof sets from 1968 to 2002 come in a wooden display case box by PCS Stamps & Coins with key. Each proof set is in its original hard plastic case. 1968 (with 40% silver Kennedy). (with 40% silver Kennedy). 1973 (with Eisenhower dollar). 1979 with Susan B. 1980 with Susan B. 1981 with Susan B. 1999 (plus state quarters proof set). 2000 (plus state quarters proof set). 2001 (plus state quarters proof set). 2002 (plus state quarters proof set). See pictures for details. We aim to please.