Germany 1931 Graf Zeppelin Polar Flight Postal Card Friedrichsafen Leningrad Russia

Postal card franked with 1RM Polar Flight Air Post, tied by Friedrichshafen c.d.s. (Jul 24), with rose Luftschiff Graf Zeppelin / Polarfahrt 1931 flight cachet and Par Avion Zeppelin / 25 VII /31 / Leningrad datestamp, trivial spot at top margin, else very fine. (Mi. 202a)