Fort Knox Bar is an INGOT of gold that is produced by the United States Mint. It is a bar of gold that is made from 99.99% pure gold and is stamped with the words 'Fort Knox' on it. The bar is produced in sizes ranging from 1 ounce to 400 ounces, and is used for investment purposes. The Fort Knox Bar is one of the most popular gold bars in the world, and is highly sought after by investors due to its purity and value.