Part VI. Striking Errors:
Foldover Strikes:
Paraxial 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.
Side view schematic of a paraxial fold. The rectangles represent the hammer and anvil dies respectively. The black line represents the planchet and the location where the fold begins to occur.
A 1999 cent with a very small foldover flap fused to the reverse face. It is the result of a paraxial fold very distant from the planchet’s horizontal axis. An edge strike occupies the pole opposite the flap.
