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40. Paper creases: Creases are internal pinches in the paper that when opened up are seen as a white unprinted space. Value depends upon the size of the pinch, the stamp affected and the number of stamps affected in the piece. The normal occurrence is to have a pinch running through most of a pane if not all of it. Another variation is a pinch in the paper after printing but perfore perforation that results in a discontinuous line of perforations when opened up.
Type 40: A paper crease that occurred before printing was opened up before perforating (Scott 498).
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