1931 Polar Flight cover to the Icebreaker Malyguin (27.7.31), franked with 1g and 5g high values, tied by cds, with corresponding cachet alongside, Friedrichshafen transit, v.f. (Image)

Est.$250

1932 Luposta flight registered cover, attractively franked with the complete set of overprints and additional "1920-1930" overprints, addressed to Canada, with Friedrichshafen forwarding and U.S. and Canadian arrival pmks, fine cover to uncommon destination (Image)

Est.$150