1932, 10 airmail documents with good franking, as well among others balloon mail Gordon Benett flight "Basle Ruggel (Liechtenstein) " and "Basle Ebracht" always with confirmation stamp and vignette (SLK 32.7 / 7 a), special flight "Interlaken Zurich" (SLK 32.4 b) and so on. ;