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 ...

Real 1943 copper pennies can go for up to $336,000 ... 2004 Wisconsin State Quarter With Extra Leaf State quarter collectors, you might want to check out your coin from the Badger State.