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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1933 (August 5-8), 4th SAF registered cover from Leningrad to Brazil, franked by four stamps, including three Zeppelin adhesives, delivered by flight Leningrad – Berlin with connection ”29.7.33” ds, two confirmation markings and Pernambuco ”8.VIII.33” receiver, slight traces of mounts on reverse, still VF and scarce, Scott #C20, C22a, C24