Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1154:
1930 (September 10-11), Moscow Return Flight cover, addressed to Zurich, franked by 4 definitive stamps, including peasant 30k violet on watermarked paper in strip of three, tied by special Moscow date stamp, oval German confirmation cachet, Friedrichshafen drop ds on reverse, vertical fold away from the stamps, still F/VF and very scarce non-Zeppelin franking, Sieger #85D, Scott #318 x3, 417
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