2005 United States Silver Proof Set - 11 pc set, about 1 1/2 ounces of pure silver.. The 2005 United States Mint Silver Proof Set features versions of the five 2005 commemorative quarter–dollar coins in the United States Mint’s 50 State Quarters Program – honoring California, Minnesota, Oregon, Kansas and West Virginia – as well as the Roosevelt dime and the Kennedy half–dollar, all minted in lustrous 90% Silver each of these beautiful silver proof coins has a distinctive cameo appearance created by the contrast of a finely detailed frosted foreground against a mirror–like background. The United States Mint Silver Proof Set also includes proof versions of the two new Jefferson 5–cent coin (nickel) designs — the “American Bison” and “Ocean in View” — which are part of the Westward Journey Nickel Seriesâ„¢ — as well as the Sacagawea Golden Dollar and the Lincoln cent.