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  2. Coin collecting - Wikipedia

    en.wikipedia.org/wiki/Coin_collecting

    Coin collecting is the collecting of coins or other forms of minted legal tender. Coins of interest to collectors include beautiful, rare, and historically significant pieces. Collectors may be interested, for example, in complete sets of a particular design or denomination, coins that were in circulation for only a brief time, or coins with ...

  3. Balance puzzle - Wikipedia

    en.wikipedia.org/wiki/Balance_puzzle

    Given a population of 13 coins in which it is known that 1 of the 13 is different (mass) from the rest, it is simple to determine which coin it is with a balance and 3 tests as follows: 1) Subdivide the coins in to 2 groups of 4 coins and a third group with the remaining 5 coins. 2) Test 1, Test the 2 groups of 4 coins against each other: a.

  4. Coins of the United States dollar - Wikipedia

    en.wikipedia.org/wiki/Coins_of_the_United_States...

    The Quarter-Dollar, Half-Dollar and Dollar coins were issued in the copper 91.67% nickel 8.33% composition for general circulation and the Government issued six-coin Proof Set. A special three-coin set of 40% silver coins were also issued by the U.S. Mint in both Uncirculated and Proof.

  5. History of coins - Wikipedia

    en.wikipedia.org/wiki/History_of_coins

    Double-die style struck coin from Ancient India, c 304-232 BCE featuring an elephant on one face and a lion on the other. Since that time, coins have been the most universal embodiment of money. These first coins were made of electrum, a naturally occurring pale yellow mixture of gold and silver that was further alloyed with silver and copper.

  6. Numismatics - Wikipedia

    en.wikipedia.org/wiki/Numismatics

    Numismatics is the study or collection of currency, including coins, tokens, paper money, medals, and related objects.. Specialists, known as numismatists, are often characterized as students or collectors of coins, but the discipline also includes the broader study of money and other means of payment used to resolve debts and exchange goods.

  7. List of Japanese cash coins by inscription - Wikipedia

    en.wikipedia.org/wiki/List_of_Japanese_cash...

    Many Japanese domains produced their own currency which happened chaotically, so that the nation's money supply expanded by 2.5 times between 1859 and 1869, leading to crumbling money values and soaring prices. [27] [28] [23] [29] [30] These coins were often produced with the name of the domain or province on them, the mon coins produced by ...