Editor's note: This is one in a series of Coin World Collector
Basics posts on numerous types of planchet errors.
New in U.S. coinage, unplated planchets became possible in 1982
with the introduction of the copper-plated zinc cent (and briefly in
1943 with the zinc-coated steel cents).
alloy planchets are plated after they are punched from the strip but
some planchets miss the plating process. Coins struck on the unplated
planchets are grayish-white in color.
Beware of cents which have had their plating removed after leaving
the Mint. Although beyond the ability of a novice collector to detect,
any of the authentication services currently operating should be able
to distinguish between a genuine piece and an altered version.
More planchet error basics:
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