During World War II, the U.S. Mint switched to zinc-coated steel pennies to conserve copper for military use. However, a small number of 1943 pennies were mistakenly struck in copper ...
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14 Very Valuable Coins That May Be Sitting In Your Coin JarReal 1943 copper ... the Badger State. Of the 453 million Wisconsin quarters minted in 2004, thousands were somehow marked with an extra leaf on a husk of corn; some speculate a Mint employee ...
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