Class book stamp booklet: SMHD 8. E2, content Michel number 2921, mint never hinged, very rare, Richter 400.- - the amount of paper required for the production of the special stamp booklets per year approximate 25 Tons, about this to screen, were publishing houses the books produced stoped paper remainders deliverable, in 270 g / qm quality and unprinted, it happened however also that partly printed paper was supplied and processed,