Press Mark Mistake: printers term for a deviation caused by a press mark mistake
Shifted Press Mark: deviation from the intended press mark position
Split Press Mark: shifted press mark split on multible postage stamps
Press Mark Plate With Mistake: press mark from a caused by a mistake damaged printing form
Light Press Mark: clear but too light press mark
Strong Press Mark: clear but too strong press mark
Missing Press Mark: postage stamp without press mark caused by a mistake
Press Mark on Front: postage stamp with press mark on front instead on reverse
Inverted Press Mark: postage stamp with 180 degrees rotated press mark caused by a mistake
Double Press Mark: postage stamp with twice press mark