CREUTZBURGERHÜTTE, 5 Pfg dark opal-green vertical pair, 20 Pfg blue vertical pair, 25 Pfg dark brown vertical pair, 2 Mark dark brown Steelworks and Dove of Peace 1920 in mixed franking with German Empire 40 Pfg red-carmine, 60 Pfg dark grey-olive Germania 1920 (Mi.-Nr. 145 a II, 147) on registered letter to Essen, single-circle CREUTZBURGERHÜTTE (Kr. OPPELN) 28 6 22 (OS handbook 055.1), arrival 29.6.1922) on reverse. German Empire stamps were technically prohibited in plebiscite area, but postal administration did not object. Interesting early inflation-period document, age and use marks typical of period