Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 184:
ZEPPELIN FLIGHTS: 1933 (August 5-8), 4th SAF registered cover from Leningrad to Brazil, franked by four Airship values, delivered by flight Leningrad – Berlin with connection ”29.7.33” ds on reverse, two confirmation markings in red and Curitiba arrival hs, F/VF and scarce, Est. $450-$500, Sc. # C20, C22a, C24
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