Hard to tell gum crease from "regular" crease from an image. Gum creases are generally less frowned on than regular crease, but it all depends on the severity ("it all" being how much of a dicount to the price should be applied).
Gum creases/bends are caused by differences in tensionbetween the gum and the paper (which varies with humidity). BTW, this may be wrong, but I was taught if the paper is creased, it is a gum crease, if it is not creased it is a gum bend.
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