I saw you ordered some VERDI-CARE, take your time with it and only use it when absolutely necessary. When you're dealing with an old, original condition collection - don't ahead of yourself trying to conserve coins. Once you alter an original surface, there's no going back.
I recommend you do no conservation to this coin. I really like the black gunk in the devices, demonstrates the originality - because the reverse color difference is questionable. However, we got a lot of odd planchets in the 20's that produced many woody's. I can see a trace of a wood grain pattern on the obverse. I think this just another strange woody made cooler by being one of my fav coins in the series - I love 24D's. They are more scarce than people realize.
Lincoln Cent Lover!VERDI-CARE™ INVENTOR
https://verdi.care/