History of Aviation, Rare Stamps and Postal History of the World, Part 1
Lot 24:
1930 (May 13), flown cover from Sofia to Hamburg, franked by ten stamps, delivered by two connected Pioneer Flights Sofia – Nuremberg/Fürth and Nuremberg/Fürth – Hamburg, two appropriate air post markings on front, backstamped, punch at right, still F/VF and scarce, Est. $200-$300, Sc. #202, 211, C3
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