CH 1941 Stamp Day Zurich ZH, card with green add-on cancellation "UPG Geneve - Exposition Nationale 1943" cancelled 7.XII.41 Zürich

Switzerland 1941 Stamp Day Zurich ZH,
official card "1291-1941 - Journée du Timbre - Tag der Briefmarke - Giornata del francobollo 1941",
with green add-on cancellation: "1843-1943 - Exposition de timbre-poste - organisee par - l'Union Philatelique - Geneve 1943",
(Nationale Briefmarkenausstellung Genf - GEPH), in addition set on top left red rosette,
backwards with imprint of Swiss Stamp Association,
with Pro Juventute stamps, cancelled "7.XII.1941 Zürich - Schweizer Tag der Briefmarke", luxury conservation.