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  2. Japanese yen - Wikipedia

    en.wikipedia.org/wiki/Japanese_yen

    Early 1-yen coin from 1901 (Meiji year 34), 26.96 grams of 90% fine silver 20 yen coin from 1870 (Meiji year 3) In 1897, the silver 1 yen coin was demonetized and the sizes of the gold coins were reduced by 50%, with 5, 10 and 20 yen coins issued. After the war, brass 50 sen, 1 and 5 yen were introduced between 1946 and 1948.

  3. 500 yen coin - Wikipedia

    en.wikipedia.org/wiki/500_yen_coin

    These reasons have made 500 yen coins a prime choice for counterfeiters ever since they were first minted in 1982. Problems arose that year as South Korea introduced a coin worth 500 won (₩500) valued at about one tenth of the value of the 500 yen coin. [7] Both coins are made up of the same cupronickel alloy and have the same 26.5 mm ...

  4. 5 yen coin - Wikipedia

    en.wikipedia.org/wiki/5_yen_coin

    The 5-yen coin (五円硬貨, Go-en kōka) is a denomination of the Japanese yen. The current design was first minted in 1959, using Japanese characters known as the "new script" and kanji in the kaisho style, and were also minted from 1948 to 1958 using "old-script" Japanese characters in the gothic style. [1] Five-yen coins date to 1870 (when ...

  5. Penny (Canadian coin) - Wikipedia

    en.wikipedia.org/wiki/Penny_(Canadian_coin)

    According to the Royal Canadian Mint, the official term for the coin is the one-cent piece, but in practice the terms penny and cent predominate. [citation needed] Penny was likely readily adopted because the previous coinage in Canada (up to 1858) was the British monetary system, where Canada used British pounds, shillings, and pence as coinage alongside U.S. decimal coins.

  6. Sheldon coin grading scale - Wikipedia

    en.wikipedia.org/wiki/Sheldon_coin_grading_scale

    The Sheldon Coin Grading Scale is a 70-point coin grading scale used in the numismatic assessment of a coin's quality. The American Numismatic Association based its Official ANA Grading Standards in large part on the Sheldon scale. [1] The scale was created by William Herbert Sheldon.

  7. Coin flipping - Wikipedia

    en.wikipedia.org/wiki/Coin_flipping

    To choose two out of three, three coins are flipped, and if two coins come up the same and one different, the different one loses (is out), leaving two players. To choose one out of three, the previous is either reversed (the odd coin out is the winner) or a regular two-way coin flip between the two remaining players can decide. The three-way ...

  8. Checking whether a coin is fair - Wikipedia

    en.wikipedia.org/wiki/Checking_whether_a_coin_is...

    Two party polling. If a small random sample poll is taken where there are only two mutually exclusive choices, then this is similar to tossing a single coin multiple times using a possibly biased coin. A similar analysis can therefore be applied to determine the confidence to be ascribed to the actual ratio of votes cast.

  9. Coins of the Philippine peso - Wikipedia

    en.wikipedia.org/wiki/Coins_of_the_Philippine_peso

    The 1⁄2 and 1 centavo coins were struck in bronze, the 5 centavo struck in copper (75%) - nickel (25%), the 10, 20, 50 centavo and peso coins were struck in a silver composition. From 1903 to 1906, the silver coins had a silver content of 90%, while those struck after 1906 had a reduced silver content of 75% for 10 through 50 centavos and 80% ...