Wrinkles
I'm with E93 on this, in my experience... I've had several (ok, many) pre-war cards that were visually at least a solid PSA 7 come back in PSA 6 because of a wrinkle I missed on the front or back. However, these were wrinkles, not creases. I think if there is a wrinkle, but not arising to a crease which breaks the surface, it can get a PSA 6 grade.
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