60 Kopek registered postal stationery envelope with the overprint "Pleskau / 60 kop", black handstamped overprint, with additional postage Pleskau Mi number 12, cancelled with stamp "PCKOB * K * 12 1 42" and "PCKOB * a * 12 1 42", the registered postal stationery envelope is overfranked, excellent condition, expertized by Dr. Rommerskirchen BPP, photographic finding by Robert Brunel VP (2025) "The condition is flawless".