Mixed franking from postage due stamps from kingdom Yugoslavia over 0, 50 Din. With 1 Din. (strip of three) on unfree mailed domestic letter from Court in Zemun to Belgradee with dispatch postmark ZEMUN 1 / 16 from 2. 6. 41 as well with censorship postmark 63 the censor office Belgradee and arrival postmark BEOGRAD 25 / 21 from 24. 6. 41 on the postage due stamps and return shipment to Zemun. Because the Nachportierung not takes the money become could, are the postage due stamps with blue pencil nullifys and turned back become. The cover point at traces on and has at the bottom defects from opening the cover. Certificate Dr. Zydek: "covers with a such (postage) franking are extraordinarily rare. "