TARNOWITZ, German Reich official postal stationery card 10 Pfg carmine, Prussia issue 1921, additional 20 Pfg dark violet-blue official April 1920, to Kattowitz, double-circle TARNOWITZ 21 8 20 * * c (OS handbook no. 342.4), unusual prohibited mixed franking, since continued use of German Reich stamps and postal stationery in plebiscite territory was not permitted, nevertheless not challenged by postal administration, age and use wear typical of period