American Silver Eagle Coins Were Authorized by Congress in 1985 and first minted in 1986, American Silver Eagle Coins are .999 fine silver, the purest coins ever issued by the US. Each and every American Eagle coin incorporates a full troy ounce of silver which is 31.1 gram, plus copper, which is added to increase the coin’s durability to assist withstand scratching and marring. Incessantly regarded as some of the beautiful coins ever minted, the Silver Eagle’s design is in line with A.A. Weinman’s Walking Liberty, introduced at the 1917 silver half-dollar. An eagle and shield, displaying American strength and pride, backs this moving scene of freedom. Coin Content: Weight: 1.000 Troy Oz. 1.000 Troy Oz. 31.072 Grams* 31.103 Grams Diameter: 1.598 in. (40.60mm) Thickness 0.117 in. (2.98mm) *Balance of silver bullion consists of copper. Coins are Brilliant Uncirculated (BU).