The United States Mint was founded in 1792 by the Coinage Act of 1792 and began issuing the first US gold coins in 1794. For the next 210 years, the United States Mint would not issue a gold coin with greater purity than 22-karat gold. In 2006, the American Gold Buffalo Coin changed all of that with a ground-breaking coin.
American Gold Buffalo coins contain 1 Troy oz of .9999, or 24-karat, pure gold. When the Gold Buffalo was introduced in 2006 it became the purest gold coin ever issued by the United States Mint. The Proof American Gold Buffalo, like its bullion counterpart, is traditionally only available in the 1 oz weight.