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  2. Coinage metals - Wikipedia

    en.wikipedia.org/wiki/Coinage_metals

    Gold, silver and bronze or copper were the principal coinage metals of the ancient world, the medieval period and into the late modern period when the diversity of coinage metals increased. Coins are often made from more than one metal, either using alloys, coatings ( cladding / plating ) or bimetallic configurations.

  3. Crown gold - Wikipedia

    en.wikipedia.org/wiki/Crown_gold

    In the United States until 1834, gold circulating coins were minted in 22 kt crown gold using about 6% silver as well as copper. From 1834, the fineness of U.S. coin gold was decreased from the 22 kt crown gold standard to 0.8992 fine (21.58 kt); and in 1837 to 0.900 fine (21.60 kt exactly). This 90% goldcopper alloy continued in the U.S ...

  4. List of bullion coins - Wikipedia

    en.wikipedia.org/wiki/List_of_bullion_coins

    Bullion coins are government-minted, legal tender coins made of precious metals, such as gold, palladium, platinum, rhodium, and silver. They are kept as a store of value or an investment rather than used in day-to-day commerce. [1]

  5. Electrum - Wikipedia

    en.wikipedia.org/wiki/Electrum

    Electrum consists primarily of gold and silver but is sometimes found with traces of platinum, copper and other metals. The name is mostly applied informally to compositions between 20–80% gold and 80–20% silver, but these are strictly called gold or silver depending on the dominant element.

  6. Group 11 element - Wikipedia

    en.wikipedia.org/wiki/Group_11_element

    Silver coins: Silver coins are typically produced as either 90% silver – in the case of pre-1965 US minted coins (which were circulated in many countries), or sterling silver (92.5%) coins for pre-1920 British Commonwealth and other silver coinage, with copper making up the remaining weight in each case. Old European coins were commonly ...

  7. Gold coin - Wikipedia

    en.wikipedia.org/wiki/Gold_coin

    Gold coins for sale at the Dubai Gold Souk. A gold coin is a coin that is made mostly or entirely of gold.Most gold coins minted since 1800 are 90–92% gold (22‑karat), while most of today's gold bullion coins are pure gold, such as the Britannia, Canadian Maple Leaf, and American Buffalo.

  8. American Buffalo (coin) - Wikipedia

    en.wikipedia.org/wiki/American_Buffalo_(coin)

    The design of the American Buffalo gold bullion coin is a modified version of James Earle Fraser's design for the Indian Head nickel (Type 1), issued in early 1913. After a raised mound of dirt below the animal on the reverse was reduced, the Type 2 variation continued to be minted for the rest of 1913 and every year until 1938, except for 1922, 1932, and 1933 when no nickels were struck.

  9. Sasanian coinage - Wikipedia

    en.wikipedia.org/wiki/Sasanian_coinage

    Coins of copper and (uncommonly) lead were produced under various reigns. However, the tetradrachm already fell into disfavor in the early Sasanian period, during the reign of Bahram I (271-74), as it was mostly made out of copper with only a tiny bit of silver. [4] Hemidrachms also only appeared at the beginning of the Sasanian period. [4]

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