Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 90:
1930 (August 19), Switzerland and Vaduz Flight cover, franked by Zeppelin stamp of 2m ultra, cancelled on- board ”19.8.1930”, Hugo Eckener signature is alongside, Vaduz ”19.VIII.30” arrival ds, VF and scarce, Sieger#79B, €600,Scott #C36
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