Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Switzerland - Zeppelin Flights - 1931 (October 17-20), 3rd SAF postcard, franked by two stamps, including The Mythen 3fr orange brown (C.v. $115), Friedrichshafen connection, green confirmation cachet, Pernambuco ''20.X.31'' arrival ds, VF, Sieger #132, Scott #29