The 2016 W US Mint American Eagle One Ounce Silver Proof with Box & COA is a valuable coin minted by the U. This silver proof coin contains 1 oz of 0.999 fine silver, making it a desirable piece for collectors and investors alike. The coin comes encapsulated with a Certificate of Authenticity, adding to its authenticity and value. The American Eagle design, struck in proof finish, adds to the appeal of this limited edition coin from the United States.