1867: Levant 5 soldi red and Austria 10 kr. blue used on small 1871 envelope from Constantinople endorsed 'via Varna' to Vienna, tied by CONSTANTINOPEL datestamps (23/6) in black. Reverse with 'Mariahilf / Wien' cds of receipt (27/6). A superb and extremely rare Soldi / Kreuzer mixed franking. Cert. Ferchenbauer (2003).