Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 75:
1931, brown Polar-Fahrt 1931 overprint on 4m black brown, cancelled on a part of Zeppelin envelope with Friedrichshafen ”24.7.31” ds, VF, C.v. $675, Mi #458, €900, Scott #C42
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