Part V. Planchet Errors:

Rolling Mill Errors:

Rolled-thick planchet

Definition: Coin metal strip is sometimes rolled too thick.  The resulting blanks, and the coins derived from them, are thicker and heavier than normal.

This 1965 quarter was struck on a rolled-thick planchet. It weighs 7.0 grams instead of the normal 5.67 grams.