2006-S US Mint Silver Proof Set features 1.338 troy ounces of pure silver across seven 90% silver coins (five State Quarters, one Half Dollar, one Dime). Complete with Original Government Packaging (OGP) and Certificate of Authenticity (COA). Struck at the San Francisco Mint, the 2006-S US Mint Silver Proof Set features deeply mirrored, frosted proof coins. It comes complete with Original Government Packaging (OGP) and Certificate of Authenticity (COA).