Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Germany - Zeppelin Flights - 1931 (July 24-25), North Pole Flight cover to Leningrad, franked by ''Polar-Fahrt 1931'' overprint on 2m ultra, tied by Friedrichshafen ''24.7.31'' ds, red confirmation marking and Leningrad special arrival marking, VF, H.-D. Schlegel certificate, Sieger #119E, C.v. €375, Scott #C41