Error coins are those coins which during the manufacturing process were improperly formed or stamped. These coins include but are not limited to double dies, cuds, mules, wrong planchet or material errors. Sites in this category provide information about collecting, identifying and authentication of error coins. 1. Error World - Internet club devoted to error and variety coinage of all kinds. 2. Baker Numismatics - Photographic image library of coins with doubled dies, repunched mintmarks, over mintmarks, and repunched dates. 3. 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. 4. Combined Organizations of Numismatic Error Collectors of America - National numismatic organization devoted to error and variety collectors. 5. Error Coins Magazine - Monthly magazine devoted to error coin collecting. Available by subscription. 6. Israel Error Coins - The site focuses on Israeli error coins but also features Canadian, U.S. and others. See bi-metallic errors, coins struck on scrap metal, and others. 7. Jason's Error Coins - Images of a collection of error coins. Wheat cents, Mercury dimes and other assorted. 8. 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. 9. Silver Dollar VAMs - Detailed information on silver dollars, specifically Morgan and Peace Dollar die varieties known as VAMs. 10. 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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