Sale 707 The Knapp Collection of Airmail Flights

1935 (Dec 4-6), Sixteenth South America Flight, Rio de Janeiro - Recife (Michel 503), illustrated Lufthansa Airmail envelope franked with 1.50m postage tied by onboard cancel, Dec 5, with red "d" flight cachet and Recife backstamp, Dec 6; mailed by Navigator Hans Ladwig, noted as sender on back flap; some foxing, otherwise Very Fine.
Sieger 319D; €100+ ($110).
Michel €125+ ($130).
Estimate $150 - 200.