20, 60 and 60 + 40 Kopeks on an addressed, registered envelope, Michel numbers 10 y, 11 y and 12 by, cancelled with the stamp "PCKOB * K * 27 2 42" and "PCKOB * a * 27 2 42", the envelope is overfranked, slight traces of stockbook and vertical fold, expertized by Dr. Rommerskirchen BPP, photographic finding by Robert Brunel VP (2025)