Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 269:
1929 (November 2), Zurich-Dubendorf Flight mixed franking cover to Basel, franked by 10rp yellow green in block of four and Prince Johann 35rp brown and black, uprated by three Swiss air post adhesives, Friedrichshafen ”2.Nov.29” connection and Zurich the same day drop ds, VF and scarce cover, Est. $350-$400, Sc. #65, 78
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