2006 Silver American Eagle 20th Anniversary 3pc Set in Original Government Packaging (OGP) Includes a proof, uncirculated and reverse proof Silver. To commemorate the 25th Anniversary of the American Eagle Silver Coin Program, the United States Mint released a limited-edition set of five one-ounce. The three–coin American Eagle 20th Anniversary Silver Coin Set, priced at $100, will contain one coin each of a proof, reverse proof and.