Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Liechtenstein - Zeppelin Flights - 1931 (September 18-19), 2nd SAF cover, franked by four stamps, including vertical pair of the Royal couple 2fr and two air post values (total C.v. $375), tied by Triesenberg ''14.IX.31'' ds, Friedrichshafen connection and violet confirmation markings, Cape Verde ''31.AGU.31'' arrival markings on front and reverse, mostly VF and rare franking, Sieger #129, Est. $200-$250, Scott #107, C2, C6