Switzerland 1977 50th Anniversary of the Mittelholzer Flight, 4 Covers - LBF/3306Switzerland 1977 50th Anniversary of the Mittelholzer Flight, 4 Covers

Switzerland 13/2/1977 - A group of 4 covers published by the Swiss Post Office for the 50th anniversary of Mittelholzer's flight to Africa, Zurich / Gao / Cairo / Nairobi / Cape Town. Every cover is franked with a pair of the 1,50 Fr. value (Cat. Unificato 1020) and all were genuinely flown, with the arrival handstamps of the places.