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 Kolmar in the Alsace with postal stamp BEOGRAD 1 / 19 from 21.6.44 and registered stamp Beograd 1 as well with censorship seal the international country letter test place Vienna and arrival postmark KOLMAR from 29.5.44; attest Brunel: "the cover was a little improper opened, otherwise is the document in good condition. "