The reverse would have to be wheat stalks and not the Lincoln Memorial. One exists but they think it was created by spark erosion. And not the mint. Since you would have to have a wheat reverse die and many coins would have been minted before the error was discovered.
Ummm, am I missing something here? How would we be able to answer your question without pics of both sides?
Here is some information on the 1959 so called mule Cent - I want to share with you - https://www.pcgs.com/News/The-Mystery-Of-The-1959-d-Mule-Lincoln-Cent