Sale 707 The Knapp Collection of Airmail Flights

[Schedules] 1934-37, Graf Zeppelin/Hindenburg, tri-fold schedule dated February 1936, and quad-fold schedule dated February 1937, detailing the scheduled South America flights of both Graf Zeppelin and Hindenburg, as well as the Condor Syndicate airplane connections in South America; also includes a small single sheet 1934 Schedule of the Zeppelin's South America flight schedule from June through November of that year; the 1936 schedule has been folded in half horizontally, otherwise Very Fine.
Estimate $100 - 150.