30 Kopecks postal stationery cover with overprint "Pleskau / 20 kop", black hand stamp overprint, with advertising slogan 06, addressed and cancelled "PCKOB * K * 2012 41" and "PCKOB * a * 20 12 41", very fine, expertized Keiler BPP, photo expertize Robert Brunel VP (2025) "the condition is perfect.