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  2. Balance puzzle - Wikipedia

    en.wikipedia.org/wiki/Balance_puzzle

    For example, in detecting a dissimilar coin in three weighings (⁠ = ⁠), the maximum number of coins that can be analyzed is ⁠ = ⁠.Note that with ⁠ ⁠ weighings and ⁠ ⁠ coins, it is not always possible to determine the nature of the last coin (whether it is heavier or lighter than the rest), but only that the other coins are all the same, implying that the last coin is the ...

  3. Coins of the United States dollar - Wikipedia

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

    These coins began circulating on February 15, 2007. Starting 2012, these coins have been minted only for collectible sets because of a large stockpile. The Susan B. Anthony dollar coin was minted from 1979 to 1981 and 1999. The 1999 minting was in response to Treasury supplies of the dollar becoming depleted and the inability to accelerate the ...

  4. Identifying marks on euro coins - Wikipedia

    en.wikipedia.org/.../Identifying_marks_on_euro_coins

    Greek euro coins dated 2002 without these mint marks were produced in Athens, Greece. All Greek euro coins bear the standard Greek mint mark symbol of the Athens mint. Greece (2002–present) Athens Stylised acanthus leaf: Italy: Rome R: Letter: Lithuania: Vilnius Lietuvos monetų kalykla (Lithuanian Mint House, LMK) logo: Luxembourg (2002–2004)

  5. Euro coins - Wikipedia

    en.wikipedia.org/wiki/Euro_coins

    There are eight euro coin denominations, ranging from one cent to two euros [1] (the euro is divided into a hundred cents). The coins first came into use in 2002. They have a common reverse, portraying a map of Europe, but each country in the eurozone has its own design on the obverse, which means that each coin has a variety of different designs in circulation at once.

  6. A Guide Book of United States Coins - Wikipedia

    en.wikipedia.org/wiki/A_Guide_Book_of_United...

    In addition, the Red Book lists commemorative coins, mint sets and proof sets, and bullion coins, as well as significant U.S. pattern coins, private and territorial gold, Hard-times tokens and Civil War tokens. Also listed are Confederate issues, Hawaiian tokens and coins, Philippine issues and Alaskan tokens.

  7. United States Mint coin sizes - Wikipedia

    en.wikipedia.org/wiki/United_States_Mint_coin_sizes

    In particular, many silver coins changed in the 1870s. [4] The figures cited in the tables are representative of the series, and are generally the latest, or most common, figures for a given coin type. The largest coin ever minted by the US Mint was the 2019 Apollo 50th anniversary 5ounce silver dollar, weighing 155.517 grams, and 76.2 mm in ...

  8. Standard Catalog of World Coins - Wikipedia

    en.wikipedia.org/.../Standard_Catalog_of_World_Coins

    Collecting World Coins: Standard Catalog of Circulating Coinage: 1901–present, 15th Edition, publication date 2015, Krause Publications, ISBN 978-1-4402-4460-5 Digital copy available separately. Standard Catalog of German Coins: 1501–present, 3rd Edition, publication date 2011, Krause Publications, ISBN 978-1-4402-1402-8

  9. Sheldon coin grading scale - Wikipedia

    en.wikipedia.org/wiki/Sheldon_coin_grading_scale

    Coin has a sharp strike with full, original luster, May have three or four very small contact marks and a single, more noticeable, but not detracting mark. On comparable coins, one or two small single hairlines may show under (6x+) magnification, or one or two partially hidden scuff marks or flaws may be present. Eye appeal is exceptional.

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