These 20 Silver Eagle Coins, all dated 2011, are sonically sealed and housed in a crystal NGC tube. Each coin is graded Gem Uncirculated by the Numismatic Guaranty Corporation Service. Containing 1 troy ounce of 99.9% pure Silver, the American Silver Eagle Coin is one of the most highly recognized Silver bullion coins in the world. Buy Silver Eagle Coins to add to your Silver coin collection. APMEX makes it easy to buy silver by offering competitive silver prices on all silver bullion coins.