Overstrike (numismatics)

Overstrike (numismatics)

In Numismatics overstrike refers to the image on a coin which has been coined more than once. Overstriking is done deliberately when the first strike is unsatisfactory, or accidentally if the blank slips out of place or if the dies judder, resulting in a slight doubling of the design.

Sometimes old and worn coins were overstruck with new designs by later rulers. This occurred in the Roman Empire, see sestertius, and also in more modern times. Due to a shortage of silver the mint of George III of Great Britain used Spanish silver dollars in the early 19th century, and overstruck the king's image and legends on them.