postcard from Katowice (vorm. Katowice) to Raciborz (vorm. Ratibor), inadmissible white franked with a postage stamp from Poland 10 M blue slate postage stamps issue 29.3.1921, therefore also with postage due provided: 100 M blue black horizontal strip of three postage due stamps issue 15.4.1921, still used German ZKr KATOWICE 18.2.1923 (141.20), furthermore still used black rectangle cancel with one line "postage Katowice", the postcard point at a tear at bottom right margin on