A registered 2d blue envelope bearing an 1890 80pa/5d (SG 5) and a copy of "Express DOrient" label in black (Die 2), imperf., pay the postage and the additional fee for a letter sent by the Orient Express, both canc. by oval "R" with the cds of the "British P.O. Constantinople Nov.7.1891" adjasent, sent to Baden, where it arrived on Nov 10, 1891. Rare. Certificate Holcombe (1997).