KINGDOM OF ITALY. AIR POSTAGE 1933, Balbo North Atlantic Cruise Triptych 50 L. RETURN FLIGHT, new with original whole gum, left sheet margin. Slight yellowing of the gum at the upper and vertical indentation of the right section. Extremely rare. Cert. Giulio Bolaffi (1975) MNH (Sass. 53 - euro 67,500)