Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 240:
1930 (September 25), Baltic Sea Return Flight postcard to Zurich, franked by Rheinstein Castle 1m green, ”25.9.1930” on board cancellation, green confirmation cachet and the same day Berlin receiver, VF, Sieger #88Ec, Est. $100-$150 , Sc. #337
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