Rolling and counting machines are generally one in the same. The counting machine drops the coins into an open end of a "shotgun shell" type wrapper. It has a spinning wheel - hole on the front that you stick the open end of the roll into when the counter finishes filling the roll. This wheel/hole thing crimps the open end of the paper, rolling it inward onto itself. Because the wheel is metal and is spinning, placing too much pressure on the wheel with the roll will scratch the coin on the end of the roll in a circular pattern. With enough pressure one can completely obliterate design features on the end-roll coin.
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