If you have a 1959-D cent that looks like it is made out of steel, it is likely a fake or altered coin. Genuine steel cents from 1943 are rare and valuable, but a 1959-D cent that looks like it is made out of steel is not.
The value of a genuine 1943 steel cent in AU condition can range from $100 to several hundred dollars, depending on the specific condition and grade of the coin. However, a 1959-D cent that looks like it is made out of steel has no numismatic value and is worth only its face value of one cent.