Other US coins also have copper. You need to know that the wheat penny isn’t always copper. In 1943, it was made with zinc-plated steel. The Wheat Lincoln penny first appeared in 1909.

This topic came up in a 2023 forum on the Collectors Universe website regarding an eBay listing for “‘TEDDY ROOSEVELT’S Panama Penny’ 1920d Lincoln Wheat Cent/PCGS -Discovery Coin!” ...

If your penny has a mistake this could increase the ... If you have any 1943 wheat pennies, it’s worth taking them to a coin dealer to see how much you might get for them.

WHEAT 5,000 bu minimum; cents per bushel Dec 522¼ 526¼ 519¾ 523¾ +3 Mar 541½ 546½ 535 540½ — ¼ May 550½ 553¼ 542½ 547¾ — ¾ Jul 558½ 560½ 550½ 555½ — ½ Sep 571¼ 573¼ 563½ ...