1 1 / 4 PIASTER on 25 Pfennig yellow-orange and 10 PARA on 5 Pfennig green as additional postage on a 20 PARA postal stationery envelope as a registered letter from CONSTANTINOPEL 4 / 3 90 to ANVERS / Belgium, with arrival postmark ANVERS 6 MARS 1890. Expertized by Willmann and photo certificate by Dr. Hartung: "perfectly perforated and in flawless, used condition." Michel estimated at 1,500.-