Looks like Abe's chin took a decent hit and some metal has been "smeared" over. That is a relative high point on this coin design so it wouldn't surprise me if you found others coins with a similar pattern of damage.
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz