CH 1992 Stamp Day Sion VS, card imprint Invitation/Program cancelled 4.-6.12.1992 1950 Sion

Switzerland 1992 Stamp Day Sion VS,
official card "Tag der Briefmarke - Journée du Timbre - Giornata del Francobollo - Di dalla Marca postala - Sion 1992 -
Tirage officiel VSPhV / USFS / USPhS",
with imprint Invitation and backside Program (front: "Invitation", back: "Inauguration et Programme de la Cérémonie, Jeudi 3 décembre 1992), 
with Pro Juventute stamps, without address, cancelled "4.-6.12.1992 1950 Sion - Journée du Timbre - SEDUNUMPHILA", luxury conservation.