1931 Polar Flight cover addressed to Hermann Sieger, franked with 1M horizontal pair, canceled on board, with appropriate cachet and Friedrichshafen arrival pmk on back, v.f. (Cat No. C40) (Image)

Est.$250

1931 Polar Flight cover, franked with 4m and addressed to Germany, v.f. (Cat No. C42) (Image)

Est.$150

1931 Polar Flight, 2c U.S. Stationery card, additionally franked with 4m and addressed to Bedford, Virginia, with special Tourist cachet on reverse, v.f. (Cat No. C42) (Image)

Est.$150

1931 Polar Flight cover addressed to Zurich, franked with 4M canceled on board, with Icebreaker Malyguin 27.7.31 postmark alongside, v.f. (Cat No. C42) (Image)

Est.$250

1933 Chicago Flight, cacheted (printed) cover to Dallas, franked with 4M tied by Friedrichshafen cds, triangular handstamp and green arrival pmk on back, fine-v.f. (Cat No. C45) (Image)

Est.$150

193o South America Flight, cover franked with 2m and 4m (2), used on flown cover from Friedrichshafen to Harrisburg, PA, with Lakehurst arrival, fine-v.f. (Cat No. C38-39) (Image)

Est.$250