National numismatic organization devoted to error and variety collectors.

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.

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.

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

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

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

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.

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

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

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