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Combined Organizations of Numismatic Error Collectors of America
National numismatic organization devoted to error and variety collectors.
http://conecaonline.org/
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.
http://www.rotateddies.com/
Baker Numismatics
Photographic image library of coins with doubled dies, repunched mintmarks, over mintmarks, and repunched dates.
http://www.bakercoins.net/learn/images/
Error World
Internet club devoted to error and variety coinage of all kinds.
http://www.surok.addr.com/
Jason's Error Coins
Images of a collection of error coins. Wheat cents, Mercury dimes and other assorted.
http://www.error-coins.com/
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.
http://www.geocities.com/israelerrorcoins/
Silver Dollar VAMs
Detailed information on silver dollars, specifically Morgan and Peace Dollar die varieties known as VAMs.
http://www.robjoyce.com/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.
http://www.worlderrors.com/
Error Coins Magazine
Monthly magazine devoted to error coin collecting. Available by subscription.
http://www.etcmmag.com/
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.
http://studium.com/6/errorcoins.html
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