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

Worldwide Zeppelin Flights - Bolivia

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Start price: $100

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1932 (May 6-10), 4th Return SAF card and pre-printed cover from Cochabamba to Germany, each one franked by four values, card with straight line confirmation, Friedrichshafen or Berlin ”10.5.32” arrival markings, VF, Sieger #160 var, Est. $150-$200, Sc. #198/204