1933, Zeppelin letter from "Friedrichshafen-14.10.33" to the Chicago flight to Chicago with Michel DR 420, 471 and 497 and red cancel "50. Ocean crossing
1933, Zeppelin letter from "Friedrichshafen-14.10.33" to the Chicago flight to Chicago with Michel DR 420, 471 and 497 and red cancel "50. Ocean crossing