1918 (30 May) registered cover handstamped "Portofreie Dienstsache Rek." and "K.u.k. Belgeordneter bei der deutschen Ettapenverwaltung in der Dobrudscha und Verbingsoffizier bei der 3.bulgarishern Armee" (Imperial and Royal Hungarian Deputy Chief of the German administration of Dobrudja and liaison officer with the 3rd Bulgarian Army), corresponding "Deutsche Feldpost 258" registry label, nevertheless free frank privileges not recognized and charged 20h Postage Due with the "Porto" adhesive added in Vienna, fine and uncommon usage