Part V. Planchet Errors:

Wrong Planchet and Off-Metal Errors:

Double Denomination Errors:

Struck Over Pre-Existing Wrong Planchet/Off-Metal Error

Definition: A design struck over another design (either domestic or foreign) which was, in turn, struck on the wrong planchet.  Such errors are quite rare, with a significant proportion intentionally fabricated inside the mint.

This state quarter design was struck over a 2000-P nickel design which had been, in turn, struck twice on a cent planchet.  The quarter strike was off-center and has a first-strike brockage of the obverse quarter design on its reverse face.  This error may have had some assistance in its creation.  Photos courtesy of Terry Holcomb.

This 2004 Canadian cent design was struck over a 2004 Papua New Guinea 1 tohea design which had itself been struck on a Fiji one cent planchet.  The coin was cherrypicked from eBay by James Zimmerman, who expended a great deal of time and effort in identifying the host coin design and the original purpose of the planchet.  This seems to be a truly accidental error.  Photos courtesy of James Zimmerman.

This 1983 Canadian cent design was struck on an Israel 10 shekels design which was originally struck on a Canadian 1 cent planchet.  As such, the final strike generated a dual country / double-denomination error but not a wrong planchet error.  This is almost certainly an intentional error because it was struck in-collar.  The original off-metal coin would have to have been resized after the first strike, which would have caused the coin to expand beyond the diameter of the collar.  Photos courtesy of Fred Weinberg.

This 1982 Costa Rica 25 centavos design was struck over an Israel 10 shekels design which had originally been struck on a Costa Rica 25 centavos planchet.  As with the previous coin, the final strike generated a dual country/double denomination error but not a wrong planchet error.  And as with the previous coin, the last strike was in-collar, which would have required resizing of the expanded off-metal 10 shekels.  Photos by Mike Diamond