10 para on 5 Pf green and 1 1/4 piastre on 25 Pf yellow orange as additional franking on 20 para postal stationery envelope as registered mail from CONSTANTINOPEL 1 4 / 3 90 to ANVERS / Belgium, with on the back arrival cancel ANVERS 6 MARS 1890. Expertized. Willmann and photo expertize Dr. Hartung: \"perfect perforated and in faultless, used condition. \" rare properly franked registered mail the 9 a!