Auction 90, Session 2 - Worldwide Rare Stamps and Postal History
Lot 1331:
November 2, 1929, Zürich-Dübendorf 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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