Mixed franking the postage due stamps over 0, 50 Din. And 2 Din. (pair) on unfree mailed domestic letter from Court in Bela Crkva to Belgrad with dispatch stamp BELA CRKVA / 5 from 10.7.42 and arrival postmark from BEOGRAD on the postage due stamps. The cover is very fine. Expertized. Dr. Zydek and certificate Kleymann: "such covers are rare. "