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  2. Charles Proteus Steinmetz - Wikipedia

    en.wikipedia.org/wiki/Charles_Proteus_Steinmetz

    Charles Proteus Steinmetz (born Karl August Rudolph Steinmetz; April 9, 1865 – October 26, 1923) was an American mathematician and electrical engineer and professor at Union College. He fostered the development of alternating current that made possible the expansion of the electric power industry in the United States, formulating mathematical ...

  3. Visigothic coinage - Wikipedia

    en.wikipedia.org/wiki/Visigothic_coinage

    The first coins, commonly known as the pseudo-imperial series, imitate contemporary Roman and Byzantine coinage, with copied legends. After 580 coins were issued in the name of the Visigothic kings. This royal coinage continued until the second decade of the eighth century, when Visigothic rule was ended by the Islamic conquest of Iberia.

  4. Coinage metals - Wikipedia

    en.wikipedia.org/wiki/Coinage_metals

    Silver coins from about 700 BC, are known from Aegina Island. [3] Early electrum coins from Ephesus, Lydia date from about 650 BC. [4] Ancient India in 6th century BC, was also one of the earliest issuers of coins in the world. [5] The gold Croeseids, issued in Lydia, were the first true gold coins with a

  5. 5 Most Valuable European Coins Still in Circulation - AOL

    www.aol.com/5-most-valuable-european-coins...

    There's no shortage of interesting, old and rare European coins capable of commanding big money at auction -- but are any actually still in circulation and not being handled by private collectors ...

  6. 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.

  7. List of most expensive coins - Wikipedia

    en.wikipedia.org/wiki/List_of_most_expensive_coins

    List of most expensive coins Price Year Type Grade Issuing country Provenance Firm Date of sale $18,900,000 1933 1933 double eagle: MS-65 CAC United States: King Farouk of Egypt: Sotheby's [1] June 8, 2021 $12,000,000 1794 Flowing Hair dollar: SP-66 CAC United States Neil, Carter Private sale [2] January 24, 2013 $9,360,000 1787 Brasher ...

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