Mixed franking from 2 Din. With 16 Din. On properly franked foreign countries special delivery registered mail letter to Berlin with postal stamp BEOGRAD 1 / 21 from 28.2.44 and registered stamp Beograd 1 as well with censorship seal and additional censorship stamp Ag the international country letter test place Vienna and with arrival postmark on the back BERLIN REINICKENDORF east from 7.3.44; the cover was folded and a part of blanking plate is lost, attest Brunel: "the franking is rare. "