MICHALKOWITZ 2.7.1920 ZKr (210.2) on insured letter with 5 Pfg green horizontal pair, 1 Mark rose lilac block of four from two vertical coherent gutter pairs postage stamps issue smelting works and peace pigeon 1920 to Neisse, arrival postmark ZKr NEISSE 3.7.1920 at back, variety: plate flaw "large white spot in the engraving right besides of the left indication of value" (field 51 part of issue, Michel number 26 PF I) on of the lower left stamp of the block of four, expertized with photo certificate Gruber BPP "the letter places in this kind a special feature dar. The stamps and the letter are perfect quality. The above described insured letter is genuine. "