A coin is usually a piece of hard material, generally metal and usually in the shape of a disc, which is issued by a government to be used as a form of money. Along with banknotes, coins make up the cash forms of all modern money systems. Coins are usually used for lower-valued units, and banknotes are usually used for the higher values; also, in most money systems, the highest value coin is worth less than the lowest-value note.

Ancient to Early Medieval Bi-metallics - A quick review of early bi-metallic coinage.
Meta Description: [ A quick review of early bi-metallic coinage. ]
Bi-metallics Coins, Tokens - Includes articles on the subject, and some images.
Joel Anderson: World coins - An offering of world coins and paper money and associated catalogs. Interesting list of bi-metallic coins for sale, with some scans.
Meta Description: [ World coins and world currency. A wide variety of fun, interesting, unusual and historic foreign coins and currency, including recent world coins, bi-metallic coins, Nazi Coins, Primitive Money, coin books and coin supplies. ]
W.B.C.C. - Online site of the Worldwide Bi-metallic Collectors Club, created to pool information about this type of coin. Includes catalogue, an image gallery, and all the club's newsletters.
Meta Description: [ bi-metallic collectors club ]
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