[The following excerpt is published courtesy of DLRC Press and its author, John Feigenbaum. This information was originally published in 1994 in The Complete Guide to Washington Quarters.]
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Even under the strictest standards of quality control, any coin with a mintage in the millions is inevitably going to see a fair number of errors enter the marketplace. The Washington quarter series is no exception. The following coins represent just a few of the errors seen in this series. Rarity ranges from the relatively common (for an off-centered specimen) to the rare (for a coin that has been triple-struck).
Off-center piece dated 1966 (Courtesy Fred Weinberg)
Undated quarter struck on a dime planchet. (Fred Weinberg)
Undated proof quarter struck with two planchets between the dies. Somewhere, there
Undated quarter struck on a clad shell. (Photo courtesy Bill Fivaz)
1976-D Bicentennial quarter struck off-center with two major clips. (Bill Fivaz)
Undated Washington quarter, quadruple struck - all off-center. Very unusual. (Bill Fivaz)
Another unusual coin.. this Bicentennial quarter was struck over a previously struck 1976 dime; a so-called double denomination coin. (Bill Fivaz)
(left) - 1980-D struck with a copper streak embedded in the planchet. (Bill Fivaz) (right) - Undated quarter with a major indentation. Some object must have interfered with the strike. (Bill Fivaz)
A quarter with a large rim cud at the date. This error is caused by a progressive die crack which eventually leads to a piece of the die falling off. In production, the coin is filled in with extra metal. (Bill Fivaz)
