History of Aviation, Rare Stamps and Postal History of the World, Part 1
Lot 41:
1920 (October 26), Pioneer Flight registered cover from Danzig to Berlin (10.27) then to Copenhagen (10.29), franked by four stamps, including complete air post set, undelivered and returned to sender, F/VF, Est. $150-$200 , Sc. #C1-3
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