Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1143:
1931, Ice-Breaker ”Malygin” and Graf Zeppelin, 30k-2r, perforated (L12½) complete set of four used on registered air post cover from Moscow to Germany on March 7, 1933, Berlin Luftpostamt marking, transit and arrival ds on reverse, VF and scarce complete set franking, Est. $600-$700, Scott #C30a-33a
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