1 pfennigs German Reich permanent issue Hindenburg with black overprint "Pleskau 20 kop" on unlabeled Soviet postal stationery (Michel number P160) with pasted over postage stamp impression, cancelled by cancel "PCKOB * K * -5 9 41", very fine, issued only 1.165 piece, expertized Pickenpack, photo expertize Pickenpack (1977), expertise Robert Brunel VP (2025) "the condition is perfect