Zeppelin Flights. 1931 (March 28-30), Hungary Direct and Return Flight postcard and cover, franked by two or three air post values, including Zeppelin overprint on 1p orange, two different confirmation markings in blue or green, Budapest or Friedrichshafen receivers of March 29 or 30 respectively, housed on two pages from a Collection, VF, Sieger #102Aa, Ba, C.v. €300 (Image)