Sale 707 The Knapp Collection of Airmail Flights

1935 (Sep 23-26), Thirteenth South America Flight, Friedrichshafen - Recife (Michel 480 d), cover franked with 1.51m postage including 1m Zeppelin and two sets of the 1935 Nazi Congress Issue tied by onboard cancels, Oct 25, with red "d" flight cachet and Recife backstamp; sent by "First Flighter" Clara Adams to herself in Pernambuco, with her return address, and in effect, her autograph, at the Kurgarten Hotel in Friedrichshafen on the back flap, Very Fine.
Sieger 322A; €80+ ($80).
Michel €70+ ($80).
Estimate $150 - 200.