Just some sort of stain.
I have some mint packaged Zinc Cents with the same damage. The Mint used some chemical that probably created it and even though it's from the mint...
Definitely damaged and welcome to CT.
It looks like it took a hit. In other words, damaged. If it is a die break it's in a strange place.
If it's raised it's a die crack. If not raised it's a plating issue. I'm leaning to the plating issue as I don't see it raised.
Definitely damaged
In this case it's just a sample slab. That coin's been in that slab most of it's life.
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