2011 W Silver Eagle Proof Dollar US Mint Silver Eagles contain 1 Troy ounce of .999 fine silver and struck from highly polished dies.Coins come encapsulated in plastic in original box from the U.S. Mint including certificate of authenticity. Proofs issued from 1986 to 2013 with S and W mint marks. Contains 0.999 Troy Ounces of Silver. Comes in Box with Case and Certificate of Authenticity.