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CH 1963 Pro Aero - 25 years Pro Aero 1938-1963 and 50 years of crossing the alps by Oskar Bider 13.VII.63 - decorative sheet with 20 stamps, First Day Cancellation "13.VII.1963 - Langenbruck-Bern-Locarno - 50 Jahre Alpenüberquerung durch Oskar Bider", (SBK F46 (FO46) , Michel 780)