Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1

Worldwide Air Post Stamps and Postal History - Russia and Soviet Union

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1924 (September 18), Pioneer Flight Moscow – Berlin registered cover franked by black surcharges 5k/3r- 20k/10r, complete set of four and a single of 10k/5r on reverse, boxed ”Mit Luftpost” and ”Mit Luftpost Befordert. Bahnpostamt 4.” markings, Berlin ”20.9.24” arrival ds, mostly VF, Scott #C6-9