75. Printer's waste: Every printing operation has waste, and the vast majority of it is destroyed. What reaches the public often is material that was sold for scrap or was on the way to destruction when someone appropriated it to try to make a profit. Even though it is tainted as far as collectors are concerned, it is still desirable and often has significant value.
Type 75: Incomplete production, such as this imperf, engraved black missing Scott 2541, is easily identified as printer's waste, probably stolen.