This coin is the latest issue of the pure (99.99%) gold Buffalo. You can buy these coins certified by the grading company NGC as being a perfect MS70 coin, and encased in its sealed holder.
This is the fourth year these Gold Buffalo coins has been released. The obverse features a Native American, and the obverse shows an American Buffalo or bison. The design is based on that for the 1913 Buffalo nickel, by James Earle Fraser.
The coin weighs one Troy ounce, or 31.108 grams, is 32.7mm in diameter and 2.95mm thick.
The MS70 Gold Buffalo is available here: