CH 1976 Stamp Day Glarus GL, cover cancelled 4.-5.12.76 8750 Glarus with imprint LEMANEX

Switzerland 1976 Stamp Day Glarus GL,
official card "Tag der Briefmarke - Di dalla Marca postala - Journée du Timbre - Giornata del Francobollo - 1976 -
Verband Schweizerischer Philatelisten-Vereine - Union des Sociétés philatéliques suisse - Unione della Società Filateliche svizzere",
with imprint "LEMANEX 78 - Exposition Nationale de Philatelie - Lausanne 26.4.-4.5.78",
without address, cancelled "4.-5.12.76 8750 Glarus - 40 Jahre Tag der Briefmarke", luxury conservation.