Mixed franking from 3 Din. With 4 Din. On correctly franked domestic registered letter to Valjevo with postal stamp OBRENOVAC / 2 from 23. 6. 42 as well with censorship seal with censorship postmark 039 / Bgd. With additional date cancel 24. VI., what rare occurs, and arrival postmark from Valjevo, the 3 Din. Postal stamp is being a franking rather rare, the cover was folded and is to the margins yollowed, expertized Krischke