Could this be an error half D mint mark

[Hinkle]

[Conder101]

Looks like there is either something stuck on the coin, or it has a large die chip.

[Hinkle]

By looking at it it seems like someone used a melting tool, then pressed it into the spot. Idk weird. Lol

[Conder101]

It looks to me like the spot is raised, but I admit it is hard to tell.

[Just Bob]

If that oval mark below the 19 is incuse, (concave) then I would guess that something struck the coin, flattening part of the mint mark and Lincoln's coat lapel.

[Hinkle]

Would you like a better angle pic. Just to be sure.

[Just Bob]

I can make the spot appear raised or sunken, depending on how I tell my brain to see it. (Interestingly, it is easier to see it as raised if I turn the picture upside down.) Judging by the shadow, it looks incuse to me, but you have it in hand, so you can judge for yourself. If it is raised, then Conder101' s suggestion of a die chip is likely the answer. If it is sunken, then I would say damage.