14 D. Airmail on correctly franked airmail foreign countries R cover to Vienna with postal stamp "BEOGRAD 1 / 19" from 31.10.42 as well with censorship seal the international country letter test place Vienna and with arrival postmark Vienna from 5.11.42 on the letter back, photo expertize Brunel BPP (2006) "the single franking the airmail stamp is rare. The cover is clean and without defects. ", ex collection Belgrad