to me it looks like the obverse is corroding from the inside out. Just look around the rim; in front of Abe's forehead hair, starting to get pimples on his face, etc.
It could be several things that caused that but I don't think Lincoln had false teeth and that's what it reminds me of.
I missed that lack of teeth. LOL I thought OP was pointing at the dot. yeah, definitely overpolished die (or what ever it is called) you can see the back of the head the hairline is all .. thinned out? lol lacking the edge that is normally there. Also the back of the neck. So someone went to town over maintaining that die for longevity .. just 10k more coins ....
Can you take better pics right over the top of the obverse and reverse. Abe is missing more than his bottom lip. Do you have any acetone?
Hey can try to add pictures. But I’m having a very difficult time here. I think I have some Acetone But don’t want to hurt the coin. Thanks for your reply.
Who are you talking to? All the reponses seem good.. What does religion have to do anything with your coin?
The folks that said this was from a over polished die got it right. I'm betting this set of dies had a severe die clash and was ground and polished at the mint to remove the die clash. Also look around Lincoln's ear at how much detail has been removed from the die. I have lots of the new dollar coins and bison 5 cent coins that have lots of details missing from over polished dies.The dollar coins have severe detached head and arms and the bison coins have a really good detached leg that is easily seen . The die that struck them had a severe die clash polished off . I have a few of the awesome clashed die coins from the set of dies before it was polished. I nicknamed them the peeing bison . These modern coins may have a really good value if in mint cond. when they get more age on them. Look at the 1937 three legged buffalo nickel how high it is.
There will be lots more of these out there somewhere. Everyone this die struck will be just like yours. I have hundreds of coins from overpolished die that I found in new mint rolls of coins. When looking thru new rolls of coins if some one finds something good there usually will be lots more from the same die in the roll .