1930 East-Sea flight card with appropriate round-trip cachet, addressed to Switzerland, with Tallinn, Estonia transit and Zurich arrival pmks, v.f. (Image)

Est.US$150

1931 3rd SAF to Argentina, legal size commercial cover franked with eight adhesives, tied by Triesenberg departure pmks, with Friedrichshafen and Kriens transits, Buenos Aires arrival pmk on back, some cover folds away from the stamps, fine and rare commercial usage (Image)

Est.US$150

1936 Hindenburg flight, two registered covers, each franked with 1fr and 2fr Zeppelin, v.f., with New York arrival pmks (Cat No. C15-16) (Image)

Est.US$150