BORSIGWERK 14.4.1921 ZKr (032.2) on cover with single franking 60 Pfg blue postage stamps issue smelting works and peace pigeon to Koenigshuette, stamp with perfin (perfin) "A. B. " about 90 ? left turned (A. B. = August Borsig Borsigwerke AG Mining and Smelting Management, Borsigwerk / Upper Silesia, OS handbook number 1), transport traces