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Switzerland 1978 vignette block of four partially toothless with 2 different motifs, Prof. A. Piccard - Pionier im Weltraum, Professer Auguste Piccard startete am 18. August 1932 um 05.07 Uhr mit dem Ballon FNRS in Dübendorf zum erfolgreichen Flug in die Stratosphäre. Erreichte Höhe 16 940 m ü/M. Landung 17.00 Uhr in Volta-Matuana.