No raised ridge so I'd say "no" to a die crack. And it's not really PMD since there's no "damage", at least not by my definition. To me it looks like differential toning resulting from a storage problem.
I've seen this sort of thing where a coin lays in a drawer for years with a sheet of paper or part of the coin is covered undisturbed. The exposed area gets darker ( or lighter ). Something like that may have happened. It is a straight line like the edge of a sheet of paper for example.
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