Mixed franking from 4 Din. With 16 Din. On properly franked airmail foreign countries R letter the 2nd weight step over 20 g to 40 g to Vienna with dispatch postal stamp BEOGRAD 1 / 15 from 14.12.43 as well with censorship seal the international country letter test place Vienna and on the back arrival postmark Vienna from 19.12.43; attest Brunel: \"the cover point at format contingent transport traces on. \"