Mint American Eagle 2021 One Ounce Silver Reverse Proof Two-Coin Set SEALED. Mint American Eagle 2021 One Ounce Silver Reverse Proof Two-Coin Set SEALED" is in sale since Wednesday, November 3, 2021. This item is in the category "Coins & Paper Money\Bullion\Silver\Coins". The seller is "mipo-689056" and is located in Pleasant Valley, New York. This item can be shipped to United States.