CH 2006 Stamp Day Olten SO, cover with webstamp cancelled 10. Dezember 2006 4600 Olten - registered mail

Switzerland 2006 Stamp Day Olten SO,
official cover "OLPHILA 06 - Olten - 150 Jahre Eisenbahnstadt Olten - Tag der Briefmarke 8.-10. Dez. 2006 - Journée du Timbre - Giornata del Francobollo - Offizielle Ausgabe VSPhV/FSPS/FSFS",
with matching webstamp "Tag der Briefmarke Olten 2006" (SBK PC 3.1, Michel -) and add-on stamp (SBK 1213, Michel 1993),
correct postage paid registered mail, cancelled "10. Dezember 2006 4600 Olten - Tag der Briefmarke 2006",
backside arrival cancellation "4.12.06 8708 Männedorf", luxury conservation.