5 and 40 Pfg numerals each in the block of four with line perforation L 11 on very rare, properly franked and commercially used insured letter over 4.500 RM from COSWIG 19.12.45 to Dobeln, arrival 21.11.45 reverse, superb document and one of the few pieces, the ambiguous from collector hand comes, besides with special postage step, photo expertize Stroh BPP ". In perfect condition"