50 Kopecks control mark with dark purple red typography overprint "GK. Ssarny" type II and type VIII in the vertical pair, position 20 and 25, cancelled by cancel "BERESCHINZA ROB. OBL. BERESCHINZA -6 11 41" on unlabeled Soviet postal stationery, condition of the stamps perfect, postal stationery a little scuffed corners, unsigned, expertise Robert Brunel VP (2025), Michel 800.- plus