COELN 8.10.73 (Spalink 4-10), DUESSELDORF 26. March. 73 (Spalink 11-1 N2) each on 1 / 2 Gr. postal stationery card as well DUISBURG 21. June. 75 (Spalink 10) on 5 Pfg postal stationery card, in each case clear legibly strikes the Rhein metropolises