The bison featured on the reverse side was modeled after "Black Diamond", a buffalo on display at New York's Central Park Zoo in the early 1900's.

These pure copper rounds carry the bison standing upon a dirt mound, just as on the original coin. The text ".999 Fine Copper" is stamped above the bison and the weight - "One AVDP Ounce" - is shown below.

The reverse side of each round carries the familiar profile of a Native American Chieftain, along with the word "Liberty".

• The rounds ship from the mint tubes of 20 rounds. A full box contains 25 tubes - 500 ounces.
• The weight of the rounds is in standard (avoirdupois) ounces, rather than troy ounces.
• Rounds are made by the Osborne Mint - America's oldest private mint located in Cincinnati, OH.

Check them out here:
https://goo.gl/2yzCw4