CH 1971 Stamp Day Rüti ZH, cover cancelled 5.XII.71 Automobil-Postbureau und Zusatzstempel 8630 Rüti (ZH)

Switzerland 1971 Stamp Day Rüti ZH,
official cover "Tag der Briefmarke - Journée du Timbre - Giornata del Francobollo - 1971 -
Verband. Schweiz. Philatelisten-Vereine - Union des Sociétés philatéliques suisse - Unione della Società filateliche svizzere",
without address, cancelled "5.XII.71 Automobil-Postbureau - 3" und Zusatzstempel "5.12.71 8630 Rüti (ZH) - Tag der Briefmarke",
both cancellation have been used only a short time, luxury conservation.