Germany, Reich. Michel 456 on cover, Cards sent by Zeppelin franked by 1 and 2 M sent to Bratislava over North pole – Leningrad and to Fulda, respectively. Both with red POLARFAHRT 1931 cancel, 1 M with PARAVION ZEPPELIN LENINGRAD 25 VII 31, AND 2 m with BRISE-GLACE...ARTIQUE 27 VII 31 cancel. EUR 680
