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This BLACK RUTHENIUM 2005 American Bison Westward Journey Nickel with 24KT Gold Clad Highlights 2-Coin Set includes both Philadelphia and Denver Mintage. Each coin features Thomas Jefferson design on the obverse and an American bison, representative of the wildlife encountered by the Lewis and Clark expedition design on the reverse. The coin is coated with Black Ruthenium, which is a type of platinum metal that looks like a dark platinum, but is 100 times Rarer. Ruthenium is a chemical element with the symbol RU & Atomic # 44. It is a rare transition metal belonging to the platinum group of the periodic table. Each coin is genuine legal tender of the United States and comes in an acrylic coin holder and includes a Full Color 2-sided Certificate of Authenticity.