Part VI: Striking Errors:

Struck Through Error:

Retained:

Embedded Copper foil

Definition: Thin layers of copper can be rolled into coin metal strip or struck into planchets. In most cases, the source of the copper is uncertain.  It could represent copper that flaked off a length of cent strip or from one or more
cent planchets.  It may be copper that separated from the surface of an improperly annealed nickel planchet.

Shown below is a 1972-D nickel with three pieces of copper foil embedded in the surface.  These were most likely struck into the coin.  The largest piece wraps around the coin’s edge for a short distance