Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Germany - Zeppelin Flights - 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