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 * -4 2 42" and "PCKOB * a * -4 2 42". The registered postal stationery envelope is overfranked. Excellent condition. Photo certificate Robert Brunel VP (2025): "The condition is flawless."