1912, 10 Pf. "airmail on the Rhine and Main" with 5 Pf. Additional franking on official postcard "Grand Ducal family", special cancel "Darmstadt 15.6.12", superb (Image 1) (Image)

1912, 10 Pf. "airmail on the Rhine and Main" with 5 Pf. Additional franking on airmail postcard, special cancel "Frankfurt 14.6.12", superb (Image 1) (Image)

1912, 10 Pf. "airmail on the Rhine and Main" with 5 Pf. Additional franking on airmail postcard, special cancel "Frankfurt 15.6.12", without text, superb (Image 1) (Image)

1912, 10 Pf. "airmail on the Rhine and Main" with 5 Pf. Additional franking on airmail postcard, special cancel "Frankfurt 15.6.12", superb (Image 1) (Image)

1912, 20 Pf. "airmail on the Rhine and Main" with 5 Pf. Additional franking on airmail postcard, special cancel "Darmstadt 23.6.12", on the back advertising "squire & rest Gas herd", superb (Image 1) (Image)

1928, "America flight", US postal service to the return flight, small commercial letter from "MILWAUKEE" to Schnelsen, very fine (Image 1) (Image)

1929, "world round flight", board mail, Friedrichshafen Friedrichshafen, photo postcard, superb (Image 1) (Image)

1929, "Flight to Zurich-Duebendorf", board mail, superb postcard (Image 1) (Image 2)

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1929, "trip to Boeblingen", board mail of the outward flight from 20.10, arrival postmark 3.11, R! Superb cover with contribute-vignette (Image 1) (Image)

1930, "Spain trip", board mail, superb postcard (Image 1) (Image)

1930, "journey home", US postal service, confirmation stamp type I, franked with 1.30 $, superb postcard (Image 1) (Image)

1930, "journey home", US postal service, confirmation stamp type II, franked with 65 C, superb cover (Image 1) (Image)

1930, "journey home", US postal service, confirmation stamp type II, franked with 65 C, without German special cancel! Superb postcard (Image 1) (Image)

1930, "Darmstadt circuit", superb postcard (Image 1) (Image)

1933, "Germany tour", board mail, droped Dresden, franked with 2 x Michel number 481, superb postcard (Image 1) (Image)

1935, "6. South America tour", board mail with postmark d, superb postcard (Image 1) (Image)

1928-1936, small lot of 8 documents in mixed condition (Image 1) (Image)

Switzerland: 1929, "1. North America flight", card very fine (Image 1) (Image 2)

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Switzerland: 1931, "Hungary trip", superb postcard with good franking (Image 1) (Image)