A wrong planchet error happens when a coin design is struck on a planchet (blank) intended for a different denomination or composition. These are among the most valuable mint errors because they are dramatic, easy to verify, and rare. The 1943 copper penny and 1944 steel penny are the most famous examples.
During production, leftover blanks from one denomination can remain in the production hoppers when the dies change. A penny die can strike onto a dime planchet, or a quarter die can strike onto a foreign coin blank. The resulting coin shows the design of one denomination on the metal/size of another.
Weigh the coin and measure its diameter. Compare against the standard weight and size for that denomination. A penny weighing 2.27g (the dime weight) instead of 2.5g/3.11g is a strong candidate for a wrong-planchet error. ErrorHunt has a built-in weight verification tool for this.
1943 copper Lincoln cent ($80,000 to $1.7 million), 1944 steel Lincoln cent ($75,000+), 1965 silver quarter ($7,000 to $12,000), and various transitional errors from 1982 and 2009.
Wrong-planchet errors are heavily counterfeited. Always weigh and measure the coin first, then send candidates to PCGS or NGC for professional authentication before any sale.
A coin struck on a blank intended for a different denomination — for example, a penny design struck on a dime blank.
Weigh the coin on a digital jewelry scale. Compare against the standard weight for that denomination. Any significant deviation is suspicious.
The 1943 copper Lincoln cent. One example sold for $1.7 million. Even circulated examples bring $80,000+.
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