Germany, Airmail, 1931, 2m + 4m Polar Flight Zeppelins. In combination with 1931, 1m Zeppelin, all tied by "Friedrichshafen, 17.10.31" cds's on round trip flight cover, green German flight cachet handstamp and appropriate transit date stamps, unknown and return to sender handstamps; 2m with light corner crease, Very Fine. Sieger No. 133Aa. Scott No. C41+C42+C35  Estimate $300 - 400. $0 (Image)