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.

Baker Numismatics - Photographic image library of coins with doubled dies, repunched mintmarks, over mintmarks, and repunched dates.
Collecting Error Coins - Just as nearly every family has its black sheep, virtually every coin series has its failures. These are known as errors or mis-struck coins, and have a following all their own.
Meta Description: [ Articles, instructive procedures, and photography on such hobbies as numismatics, philatelics, scale modeling, currency, and more. ]
Combined Organizations of Numismatic Error Collectors of America - National numismatic organization devoted to error and variety collectors.
Error Coins Magazine - Monthly magazine devoted to error coin collecting. Available by subscription.
Meta Description: [ Error Trends Coin Magazine, a monthly publication dedicated to serving the error coin hobby. ]
Error World - Internet club devoted to error and variety coinage of all kinds.
Jason's Error Coins - Images of a collection of error coins. Wheat cents, Mercury dimes and other assorted.
Meta Description: [ Web site about error coins ]
Rotated Die Coin Census - Census for US coins with major die rotation of 90 degrees to 180 degrees. Includes fake error detection and measurement indices.
Meta Description: [ Census for US coins with major die rotation of 90 degrees to 180 degrees. Includes Fake error detection and measurment indices. ]
Silver Dollar VAMs - Detailed information on silver dollars, specifically Morgan and Peace Dollar die varieties known as VAMs.
World Error Coins - Describes and illustrates dramatically mis-struck foreign coins. Includes information on recognizing various types of error coins as well as articles on how to get started collecting them.
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