Mixed franking from 2 Din. With 4 Din. (2) on correctly franked international registered letter to Offenbach on the Main with postal stamp BEOGRAD 13 from 10.8.43 as well with censorship seal the international country letter test place Vienna and with arrival postmark on the back OFFENBACH (MAIN) from 18.8.43; the cover is slightly yollowed, expertized Brunel