PART VI. Striking Errors:

Multiple strikes: 

On-center/Off-center

Definition: Multiple strikes can be either on-center or off-center. The reasons for multiple strikes are as varied as the number of strikes that can occur. Ejection failures which prevent a planchet to correctly discharge from the striking chamber are numerous.

A 1985 10 pesos from Argentina which has been struck off-center a minimum of 17 times. This coin was highly distorted by several other planchets entering the striking chamber. Complete details of each strike were obliterated by these intruding planchets.