A double denomination is when an already struck coin is struck by dies intended for another denomination. An example is a struck dime over-struck by dies intended for a Lincoln Cent and this example is often pet-named 11 cents.
Dual Denomination
A double denomination is when an already struck coin is struck by dies intended for another denomination. An example is a struck dime over-struck by dies intended for a Lincoln Cent and this example is often pet-named 11 cents.