Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 74:
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
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