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.
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.
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.
Jason's Error Coins
Images of a collection of error coins. Wheat cents, Mercury dimes and other assorted.
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.
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