Top 10 Rare U.S. Coins | LiveScience: "1943 Copper Penny The Second World War meant big rationing on copper, and the US Mint was no exception. Most wartime pennies were instead made of a brass-steel alloy, except for a few struck from the outlawed bronze (a copper alloy). If you find one of these anomalies - the common brass version will stick to a magnet, while the bronze won't - it could be worth big bucks."
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