Katowice 24.12.1921 ZKr (141.29) on cover with 10 Pfg orange red vertical pair, 40 Pfg green olive postage stamps issue smelting works and peace pigeon to Gdansk / free city Gdansk, the 40 Pfg-stamp with perfin (perfin) "P. G. " about 90 ? to the right turned (P. G. = P. G. Mueller, Katowice OS, OS handbook number 15), transport traces