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Switzerland 1957 Stamp Day Basel BS, official card "Tag der Briefmarke - Journée du Timbre - Giornata del Francobollo 1957 - Verband Schweizerischer Philatelisten-Vereine - Union des Sociétés philatéliques suisse - Unione della Società filateliche svizzere - Briefbote am Rathaus zu Basel", with Pro Juventute stamps, cancelled 1.XII.1957 Basel Tag der Briefmarke, luxury conservation.