Significance
During the height of the United States' involvement in World War II, there was a shortage of copper for use in ammunition and other equipment. This forced the U.S. Mint to come up with a replacement material to make the penny.
Time Frame
The steel penny was struck only in 1943. A few rare 1944 steel pennies exist because of an error at the Mint during the 1944 striking.
Identification
Steel pennies were minted in all three Mints: Denver, San Francisco and Philadelphia. Pennies minted in Denver and San Francisco are marked with a "D" or "S" below the date.
Value
An original 1943 steel penny is not considered a rare U.S. coin. The value of the coin ranges from 10 cents for circulated condition up to $70 for near-perfect, uncirculated condition.
Fun Fact
A 1943 steel penny is the only regular-issued coin that can be picked up by a magnet. It is also the only coin not containing copper to be circulated.