Sale 707 The Knapp Collection of Airmail Flights

1931 (Aug 29-Sep 1), First South America Flight (Michel 216e, f, Ic), a card and two covers with onboard cancels, the card franked with 2m Zeppelin, dropped to Praia, mounted on a colorful, professionally handmade album page (text in Dutch); the covers, with 4m Zeppelins, to Rio de Janeiro and to Recife, Very Fine.
Sieger 124Ab, Bb, Cb; €500 ($530).
Michel €230 ($240).
Estimate $150 - 200.