It's not really a print flaw, which I consider to be flaws from the press or handling.
It's from a mark on the negative used to make the plate. It would be on about half or 1/3 of the 54 mays produced. A genuine difference in that plate position, which should be treated as a variation even if it's not major enough to catalog or recognize. (and there are plenty that are recognized that are far more trivial)
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