Bidspirit auction | Proof 1979-s TY I Washington

Proof 1979-s TY I Washington Quarter 25c Grades GEM++ Proof Deep Cameo - 1979-s TY I Washington Quarter 25c Grades GEM++ Proof Deep Cameo. In 1979 the U.S. Mint used two different mint marks to strike Proof coins, including the Washington quarters. The Type 1 Washington quarter will have a filled S mint mark, while the Type 2 will have a clear S mint mark.