Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 183:
ZEPPELIN FLIGHTS: 1931 (July 25-27), North Pole Flight registered cover from Leningrad to Ice-Breaker ”Malygin”, franked by perforated 30k, 35k, 1r and 2r, complete set of four, tied by Leningrad special ds, red confirmation cachet and other appropriate markings, Ice-Breaker ”27.VII.31” drop and Moscow receiver, VF and scarce, H. Sieger certificate, Est. $700-$800, Sc. # C30-33
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