PART VI. Striking Errors:
Malrotation Errors:
Definition: Malrotation errors are restricted to coins with polygonal or scalloped edges. If the points of a polygonal planchet overlap the “flats” of the collar, or if the points of a scalloped planchet overlap the “peaks” of the collar, the planchet will not fit. If the collar is unyielding (a stiff collar error), the planchet will driven into the collar, forcing the points upward.
Below is an Indian 20 paise that is normally 6-sided. Here the coin has been forced all the way into the collar. Exaggerated points of metal extend upward around the rim and edge. This coin also appears rounder than normal due flattening of the points.
Below is an Indian 10 paise that is normally 8-sided with a scalloped shape. This planchet was also forced completely into the collar. It too shows high points of metal around the rim and edge of the coin.
