It does look like a repunched date, I have no idea if it is unlisted or not, but apparently DVCollector doesn't think it is, and I don't see any die cracks, I see what looks like it might be laminations.
I would have to agree with Zeewool's observation, A die crack would be a raised area above the field not a valley or "cut like" into or below the surface, however a lamination would be....
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