Coin may have been subjected to near red heat, and then dropped into water. Just for fun, I have done this sort of thing myself, and the result is as exactly what we see here.
You get some black looks from check-out chicks when you offer them for payment!
Evident corrosion on both sides. To me, just a discolored coin that's been stored in an environmentally-challenged (damp?) environment for a long time. I don't see "Black Beauty" here at all.
Taking another look at the third image now makes me wonder about this one. I see the color wearing off on some of the highest points. A black beauty shouldn't do that. The metal is darken from the heat. So I'm starting to question this one.
I find these annealing errors so impossible to distinguish from altered coins. Is there a reliable way that an expert can tell the difference with the real thing in hand, or is it as more-art-than-science as it seems?
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