5, 12 and 30 Pf Hitler "Ostland", together as properly franked franking on registered airmail cover from "RIGA 7.1.44" over international country letter test place Königsberg / Pr. To a Factory for laboratory supplies to Marburg / Lahn (arrival postmark from 12.1.1944). Addressor was the university in Riga. Nice and in this kind rare document