Italy flight 1933, return flight, Vatican post, additional franked 75 C postal stationery card with 2, 50 L Pius from Vatican 28.5. as pure Vatican franking, without any Italian additional franking or Zeppelin special stamps as extremely scarce variety, blue green flight stamp, transit special cancellation Rome 29.5, arrival -special cancellation Friedrichshafen 30.5. on face, superb, according to Longhi only 40 such examples known, expertized Diena (Longhi 724, approximate 8.000 Euro)