Baker Numismatics - http://www.bakercoins.net/learn/images/
Photographic image library of coins with doubled dies, repunched mintmarks, over mintmarks, and repunched dates. |
Collecting Error Coins - http://studium.com/6/errorcoins.html
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 - http://conecaonline.org/
National numismatic organization devoted to error and variety collectors. |
Error Coins Magazine - http://www.etcmmag.com/
Monthly magazine devoted to error coin collecting. Available by subscription. |
Mint Error News Magazine - http://minterrornews.com/
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. |
Rotated Die Coin Census - http://www.rotateddies.com/
Census for US coins with major die rotation of 90 degrees to 180 degrees. Includes fake error detection and measurement indices. |
Washington Dollar Errors - http://www.washingtondollarerrors.com
Information regarding errors on the 2007 George Washington dollar coin. |
World Error Coins - http://www.littlemistakes.com/WorldErrors/
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. |