Sale 707 The Knapp Collection of Airmail Flights

[Photos] 1900-12, early Zeppelins, about 90 photographs and 25 picture postcards featuring Airships L.Z. 1-9, L.Z. 10 & L.Z. 12; most of it related to L.Z. 1-5; includes the airmail card with special stamp for the Apr 1913 Rhine River flights of the L.Z. 9, mounted on a colorful, professionally handmade album page (text in Dutch). A most interesting lot, scanned in its entirety.
Estimate $750 - 1,000.