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: $75

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1931 (September 13), Frankfurt-on-Main Flight postcard, franked by Allegory Eagle 35c in block of four, Friedrichshafen ”13.9.31” connection, oval Flight marking and the same day Frankfurt arrival ds, VF, Sieger #128 var (this confirmation marking is not mentioned in Sieger or Michel), Est. $100-$150, Sc. #C13