Part VI. Striking Errors:

Foldover Strikes:

Double foldover strikes (a.k.a., Z-fold)

Definition: Due to a misfeed or ejection mishap, a planchet or coin momentarily ends up in a vertical position, and is folded over by the impact of the hammer die.

 On rare occasions there may be two paraxial folds at opposite ends of the planchet/coin. This would result in a Z fold.

Schematic illustration of a double paraxial fold (“Z-fold”).