Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 43:
1931 (June 28), Schwaben Flight postcard, franked by two stamps, tied by oval date stamp, Friedrichshafen ”28.6.31” connection and Böblingen the same day arrival, violet confirmation, VF, Sieger #112, Scott #C29
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