2005-S US Mint Silver State Quarter Proof Set With OGP & COA. This 2005-S US Mint Silver State Quarter Proof Set comes with the original government packaging (OGP) and a certificate of authenticity (COA). The set contains five uncirculated quarters, each made with 0.9 fineness silver, and struck with proof quality at the San Francisco Mint in the United States. The quarters feature designs representing the states of California, Minnesota, Oregon, Kansas, and West Virginia. This set is certified by the U.S. Mint and is a valuable addition to any collection. This 2005-S US Mint Silver State Quarter Proof Set comes with the original government packaging (OGP) and a certificate of authenticity (COA). The set contains five uncirculated quarters, each made with 0.9 fineness silver, and struck with proof quality at the San Francisco Mint in the United States. The quarters feature designs representing the states of California, Minnesota, Oregon, Kansas, and West Virginia. This set is certified by the U.S. Mint and is a valuable addition to any collection.