1 oz Proof Gold Buffalo with Box and COA (Year Varies). 1 oz Proof Gold Buffalo coins contain 1 oz of .9999 fine gold, and come in the original U.S. Mint-issued box with a certificate of authenticity. The obverse depicts a version of James Earle Fraser’s acclaimed “Buffalo Nickel” design of an American Indian in profile, while the reverse shows an American buffalo on the reverse. Dates of our choice priced at gold spot plus $75. Price subject to change based on market conditions and availability.