There are three categories of error coins as provided by the American Numismatic Association. Metal usage and striking errors referred to widely as “planchet errors”, die errors, and mint striking errors. This does not include the varieties that the US Mint has issued over the years. Since the inception of coin collecting there has been much controversy over what constitutes a true mint error. An organization of coin collectors named the Combined Organizations of Numismatic Error Collectors of America (CONECA) was created that specifically deals with mint errors.