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Switzerland 2022 100 years of Swiss Air Traffice Control - decorative sheet with 10 stamps - First Day Cancellation (SBK 1921, Michel 2820),100 Jahre Schweizerische Flugsicherung - 100 ans du service de la sécurité aérienne suisse - 100 anni del servizio svizzero di sicurezza aerea - 100 years of Swiss Air Traffice Control.