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. - Read more

National numismatic organization devoted to error and variety collectors. - Read more

Monthly magazine devoted to error coin collecting. Available by subscription. - Read more

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

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

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. - Read more

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. - Read more

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

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

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