Class book stamp booklet: SMHD 12 c. 7 a, content Michel number 3156 mint never hinged, very rare, Richter 350.- - 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,