Stamp 552?

Quote:
You either misunderstood or were misinformed about the purpose of the foil test. That test is meant to help distinguish engraving, which is a type of relief printing, from offset, which is a form of surface printing, along with lithography, typography, and others. Relief printing will leave an impression on the foil while surface printing will not. Flat and rotary press printing are both types of engraved printing, and both will normally leave an impression. Distinguishing those two is done by measurement or direct comparison, since a flat die image on a rotary plate will stretch when the plate is curved for the press. So rotary plate stamps will be longer in one direction or the other in comparison to the same design on a flat plate.