10 Pfg. On 20 Pfg. Prussian blue unperforated with overprint type \"IVa\" in mixed franking with 80 Pfg postal stamp as properly franking on registered letter from \"German Rasselwitz * (Oberschl. ) * 8.8.20 7.8 V\" to Neustadt * (Oberschl. ) * with arrival postmark from 8.8.20 11-12 V, photo expertize Gruber BPP: \"genuine and immaculate. On cover is the Michel number 11 c U a large Upper Silesia rarity. \"