1933 International Aviation Congress, complete set of five used in 1934 on registered and flown (19 Jan) cover to Greece, with green declaration label and arrival postmark on back, faint toned spot, otherwise v.f. (Cat No. 172-76) (Image)
1931 (10 Apr) flight from Cairo to England, cover franked with set of two and 20m Special Delivery stamp, Friedrichshafen arrival pmk on back, small piece of backflap missing, otherwise fine (Image)