Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1

Worldwide Zeppelin Flights - Switzerland

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Start price: $100

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1933, two postcards of Germany (May 1) and Switzerland (July 18) Flights, franked by one or three stamps respectively, each one with appropriate green Flight marking, Friedrichshafen ”1.5.33” and ”18.7.33” arrival ds, both are VF, Sieger #201, 222, Est. $150-$200, Sc. #144a, C10‑11, C17