The angle of the lighting (from almost directly above) is favorable for the seller. It is hard to see the crease; only the right side of the crease is visible to me. If the lighting were from a lower angle, I'm pretty sure it would be much more visible.
Try it in watermark fluid. If the crease shows in that, it's clearly a paper crease and a definite fault. Otherwise, gum creases are not uncommon on these.
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