Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Liechtenstein - Zeppelin Flights - 1933 (July 18), Switzerland Flight postcard to Luzerne, franked by Airplane over Rhine valley 1fr lake, cancelled by Triesenberg ''15.VII.33'' ds, green Flight marking, Bern drop and Luzerne ''18.VII.33'' receiver, mostly VF, Sieger#222, Est. $100-$150, Scott #C6