1939 LUXEUIL, FRANCE. On August 11 1939 an Imperial Airways Super Electra was en route from London to Zurich, with a stop at Basle, when engine trouble forced it to descend from its cruising altitude of 10,000 feet. At 3000 feet the engine caught fire and forced the plane to land at a field at Saint Sauveur near Luxeuil. The undercarriage collapsed and the Captain and First Officer were able to get out and open the passenger doors. The plane was destroyed by fire. This burned cover from England to Valais, Switzerland, has been put in an official Swiss ambulance cover that has an explanation of the crash printed on it. This cover was produced in Basel. Very uncommon.