Italian army postal service Upper Silesia 5 Pfg dark green postage stamps issue drawing numbers 1920, 20 Pfg blue postage stamps issue ironworks and peace pigeon 1920 on picture postcard (s / w) CTO ZKr OBERGLOGAU 19.5.1920 (233.3), furthermore formation stamp violet semicircle cancel 135 ? REGGIMENTO FANTERIA and violet Z1 1a COMPANIA (not in the OS handbook indicates) as well Z2 The Presidio DI upper GLOGAU / COMANDO (OS handbook IFi), picture postcards topic: Oberglogau - the ring, good condition