Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Switzerland - Zeppelin Flights - 1931 (October 17-20), 3rd SAF three-country mixed franking cover from Romanshorn to Colombia, franked by two air post values, tied by ''16.X.31'' ds, Friedrichshafen ''17.10.31'' connection, green flight cachet, Pernambuco ''20.X.31'' arrival marking, then uprated by three adhesives of Colombia and one - of Ecuador, which are paying for air mail delivery from Pernambuco to Barranquilla and Bogota, properly cancelled, VF and scarce item, Sieger #133 var, Est. $200-$250, Scott #C5, C12