I got a pile of change and saw this right away. I'm not very experienced but maybe it's something mint related? Please let me know what you thinks going on here. And if there's any value.
Post strike damage--in this case, staining. I agree with the cupholder effect, or similar. Imagine the coin sitting in a really moist environment with something placed on top of it, slightly off center. Part of the coin becomes stained, the other part less so. These are not terribly uncommon.
Yep, just a stain created by another Lincoln Cent coin (judging from the radius of the mark) and having a liquid spilled over them and left for a long period of time.
I agree with all of the above. Chemical reaction most likely created in a cup holder with either coffee or some soft drink. Post mint damage. Value: 1 cent.
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