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CH 1963 Flugpost "25 Years Pro Aero", 2x with First Day Full Cancellation (SBK F46, Michel 780) 1. Flight: Langenbrück-Bern-Locarno - (50 Jahre Alpenueberquerung durch Oskar Bider), 2. Flight: Bern-Locarno (25 Jahre Pro Aero), both on 13.VII.1963 (best quality of cancellation, stamps without rubber)