10 2 and 20 3 Pfg national stamp exhibition Wuppertal, always as correctly franked single franking, the 10 Pfg on distance postcard from" (20 b) HETTENSEN 8.12.51" to Kitzingen, the 20 Pfg with right lower corner of the sheet on long distance cover with machine cancel" (22 a) OBERHAUSEN 6.2. . . " to Düsseldorf, legitimate condition, Michel 180.-