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  2. Ruthenium - Wikipedia

    en.wikipedia.org/wiki/Ruthenium

    Ruthenium is a chemical element ... in plates and medals and for the minting of ruble coins, ... with sebaceous contaminants and producing brown/black ruthenium ...

  3. Coinage metals - Wikipedia

    en.wikipedia.org/wiki/Coinage_metals

    Ruthenium: 1967 1 ⁄ 2 Hau from Tonga was 98% palladium and 2% ruthenium. Selenium: ... including 50 black & 50 Rainbow, by Coins By Design, Murray Buckner (mintage ...

  4. United States Bicentennial coinage - Wikipedia

    en.wikipedia.org/wiki/United_States_bicentennial...

    Regardless of when struck, each coin bears the double date 1776–1976 on the normal obverses for the Washington quarter, Kennedy half dollar and Eisenhower dollar. No coins dated 1975 of any of the three denominations were minted. Given past abuses in the system, the Mint advocated against the issuance of commemorative coins starting in the 1950s.

  5. Precious metal - Wikipedia

    en.wikipedia.org/wiki/Precious_metal

    One of the largest bullion coins in the world was the 10,000-dollar Australian Gold Nugget coin minted in Australia, which consists of a full kilogram of 99.9% pure gold. In 2012, the Perth Mint produced a 1-tonne coin of 99.99% pure gold with a face value of $ 1 million AUD, making it the largest minted coin in the world with a gold value of ...

  6. 1943 steel cent - Wikipedia

    en.wikipedia.org/wiki/1943_steel_cent

    The coin was found in a badly damaged state, with two large gashes and a slight bend. Believing it to be a steel cent, the discoverer straightened the coin in a bench vise so that it would fit inside a coin album. The coin weighs 2.702 g. [8]

  7. Bi-metallic coin - Wikipedia

    en.wikipedia.org/wiki/Bi-metallic_coin

    The first modern circulating bi-metallic coin was the Italian 500 lire, first issued in 1982. [7] Based on the minting process of the lire coin, A list of All bi-metallic coins can be found here. The first ever tri-metallic circulating coins were 20-francs coins introduced in France and Monaco in 1992.