1931-32 cover and card, the former addressed to Curtiss-Wright Airplane Co. in USA, canceled on board, with 16 June 31 datestamp, with Rio de Janeiro arrival pmk on back, the latter picture postcard (DOX with 12 motors), with appropriate cachet and Berlin arrival pmk, v.f. (Image)

Est.US$150

1932 two different private 6pf stationery cards (each showing "the world's largest Flying Boat"), with violet "Erinnerungskarte" DO.X 1932 cachets, used in Hamburg and Frankfurt, also two additional picture postcards, one with 6pf franking and used in Bremen, the other unaddressed, each with red or green Do X Deutschlandflug 1932 cachet, fine-v.f. (Image)

Est.US$250

1933 Passau-Schweiz Flufschiff Do.X 1933 cachet, five covers or cards, different frankings and destinations, some toning, mostly fine-v.f. (Image)

Est.US$250