The half-ounce American Gold Eagle comes from the Gold Bullion Coin Act of 1985, Public Law 99-185, which President Reagan signed in December 1985. Written into 31 U.S.C. 5112, it gave the $25 piece a diameter of 27.0 mm and a weight of 16.966 grams holding half a troy ounce of fine gold. The same law required reeded edges and named the inscriptions, and it told the Treasury to buy newly mined American gold for the coins, falling back on government reserves only if none could be had at the world price. Nothing could be sold before October 1, 1986.
The law priced the coins at the market value of their gold plus the cost of making and selling them, and told the Treasury to sell in bulk at a discount. In practice bullion coins leave the Mint only through its authorized purchasers, large firms that buy in bulk and supply dealers, so each year's bullion figure counts the coins of that date the Mint delivered to them. Proof and burnished coins are different: the Mint offers them to collectors itself, one at a time or packed in sets.
















































