Airmail cover fr. with 4M 1931 Zeppelin (Polar flight) canc. "GRAFZEPPELINEN*27.7.1931", via "ARQTIQUE*27.VII.31", arr. "MOCHBA*26.8.31". Airmail cachet "LUFTSCHIFF GRAF ZEPPELIN POLARFAHRT". (Mi. 458-900E as stamp).