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     Pennies were made of steel in 1943 because copper was in  supply for use in equipment to help  World War II. That was the only year that Lincoln pennies were not  of copper. 

     A  coin collector was eager to pay the huge sum for the coin because it was one of a kind. And that collector  had a 1943 copper penny from each of the other two US Mints. 

     You might be surprised to  what some of your own coins are  . The more scarce any collectible(可收藏的) item is, the higher the  tends to be. It is possible that you might have a small  sitting in your pocket right now!