Iceland flight 1931, Icelandic post, destination Spain, registered letter with 30 A, 1 Kr. and 2 Kr. Zeppelin from Reykjavik 30.6, small cancellation type with thin grid lines, flight stamp and Icelandic flight stamp "Loftleidis med . Count Zeppelin" on face, arrival Friedrichshafen 3.7, transit via Stuttgart 4.7. and arrival Barcelona 4.7. reverse, sound.