In 1943 as copper and nickel were needed by allies of the war, almost all circulating pennies were made from zinc-coated steel. But in one of the most valuable errors in coin history, some pennies ...
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 ...