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Photographic image library of coins with doubled dies, repunched mintmarks, over mintmarks, and repunched dates.

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.

National numismatic organization devoted to error and variety collectors.

Monthly magazine devoted to error coin collecting. Available by subscription.

Internet club devoted to error and variety coinage of all kinds.

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.

Images of a collection of error coins. Wheat cents, Mercury dimes and other assorted.

Available both as a print magazine and an online PDF magazine with articles, features, and discoveries of major mint errors (striking errors) from the United States and around the world.

Census for US coins with major die rotation of 90 degrees to 180 degrees. Includes fake error detection and measurement indices.

Detailed information on silver dollars, specifically Morgan and Peace Dollar die varieties known as VAMs.

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.