Mint Silver Proof Set w/ COA & OGP – 90% Silver Coins, Complete. Enhanced Listing Description with Embedded Keywords. For sale is a 2001 U. Mint Silver Proof Set, complete and in Original Government Packaging (OGP) with the official Certificate of Authenticity (COA) included. This 10-coin set features deeply mirrored proof strike coins, including. Five 90% silver State Quarters (NY, NC, RI, VT, KY). 90% silver Roosevelt Dime and Kennedy Half Dollar. Jefferson Nickel, Lincoln Cent, and Sacagawea Dollar. All coins are sealed in their original hard plastic U. Mint case, untouched and preserved. A must-have for any collector of silver proof sets, U. Mint issues, or state quarters.