An “impossible mint error” is a phrase used by mint error dealers and collectors to describe a mint error that defies logic and boggles the mind as to its method of manufacture, whether it was assisted or not and how it could have credibly occurred during the normal production of coinage. The following “impossible error” appears to have been struck as a legitimate mint error but several anomalies occurred in its production.

This mint error started as a Lincoln Cent which was a deep obverse die cap. Instead of being caught and discarded by the Riddlers and destroyed as a mint error, it was subsequently struck by a Roosevelt Dime obverse die. It then became an obverse die cap and took the shape of the obverse Dime die. This unique dual denomination dual cap off-metal is in Gem Mint State condition with blazing red color.