2015-w 1 oz .999 fine Proof Silver American Eagle orig box w/COA 1825 American Eagle One Ounce Uncirculated Coin 1825 American Eagle One Ounce Uncirculated Coin Proof Set. This lot is for the 2015 proof American Silver Eagle. The American Silver Eagle is the only silver bullion coin in the world whose purity is guaranteed by the government of the United States. It stands at the summit of a two hundred year history of American silver coinage. American Silver Eagles are composed of silver mined exclusively in the United States with a purity of .999, making them the purest silver bullion coins ever minted and offered to the public by the United States. The American Silver Eagle is considered by many to be the most beautiful coin in production today. This Proof Eagle is in the original mint issued satin-lined velvet box with the certificate of authenticity. American Silver Eagle Proof Coins are true collector’s items and, as such, are only produced in exceedingly limited quantities each year.