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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 ...
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 ...
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.
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
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.
Download as PDF; Printable version; In other projects ... Citation templates such as Citation Style 1 and Citation Style 2 generate COinS metadata. If a template is ...
The names of these coins have all been defined by Congress in 31 USC 5112 . Quoting the part under discussion here: (5) a 5-cent coin that is 0.835 inch in diameter and weighs 5 grams. Additionally, all US coins have their names printed right on them. A dime is a "dime", a quarter dollar is a "quarter dollar" and five cents is "five cents".
Roman imperial coin, struck c. 241, with the head of Tranquillina on the obverse, or front of the coin, and her marriage to Gordian III depicted on the reverse, or back side of the coin, in smaller scale; the coin exhibits the obverse – "head", or front – and reverse – "tail", or back – convention that still dominates much coinage today.