Gliwice 4.12.1920 ZKr (089.26) on local letter with 10 Pfg orange red, 50 Pfg grey postage stamps issue smelting works and peace pigeon, the 10 Pfg-stamp with perfin (perfin) "W. &L. " (W. &L. = Weimann & Lange ferric and metal foundry, machinery and fittings factory, Gliwice, OS handbook number 18), transport traces