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Switzerland 1943 W (Semi-postals and Special issues sold at an additional premium) memorial bloc GEPH Geneva (Genf) - National Stamp Exposition, "100 Jahre Schweizerische Postmarken (Doppel-Genf) 1843-1943", SBK W18, Michel Block 10, bloc with red Special First Day Cancellation "GENEVE 17.IX.43 GEPH - EXPOSITION PHILATELIQUE NATIONALE", luxury quality.