The easiest way to determine if a 1943 one cent is made of steel, and not copper, is to use a magnet. If it sticks to the magnet, it is not copper. If it does not stick, the coin might be of copper and should be authenticated by an expert.

In recent years a “1943 S” (San Francisco Mint) copper coin has gone for about $60,000 dollars at auction. I remember the prices from the P (Philadelphia) mint ranging from around $10,000 many years ago to $73,000 in recent times.