Everybody makes mistakes and
the United States Mints are no exception. The odds of producing
billions of coins each year with no errors is simply too great.
Normally, error coins are caught through the usual quality control
procedures but, occasionally, some of the mistakes get by the inspectors
and enter the normal channels of circulation. Some error coins may
have been made deliberately, as their very existence is cause for
The categories at right
feature some of the most dramatic and important error coins that have ever
appeared on the market.