Were any pennies minted that were not copper?

1943 cents were made out of scrap steel coated with zinc because copper was needed to make ammunition.

A few bronze blanks left over from 1942 were accidentally mixed in with the steel blanks and were struck with a 1943 date. These errors are extremely rare and are worth tens of thousands of dollars at a minimum.

Bronze cents were resumed in 1944 but a few leftover steel blanks were similarly struck with a 1944 date.