Editor's note: This is one in a series of Coin World
Collector Basics posts on numerous types of planchet errors.
During the preparation of the planchet strip, foreign
materials — grease, dirt, oil, slag or gas — may become trapped just
below the surface of the metal. Coins struck from this strip later may
begin to flake and peel since adhesion is poor in the location of the
5-cent pieces are particularly susceptible to lamination, due to
the poor mixing qualities of the metals used during the war metal emergency.
More planchet error basics:
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