CH 2004 Stamp Day Dietikon ZH, cover cancelled 10.12.04 53111 Bonn Limattalphila with add-on cancellation Deutsche Post

Switzerland 2004 Stamp Day Dietikon ZH,
official cover "LIMMATTALPHILA 04 Dietikon 10.-12. Dezember 2004 - Energie aus Wasserkraft - Tag der Briefmarke - Journée du Timbre - Giornata del Francobollo - Di dalla Marca postale - Offizielle Ausgabe VSPhV / FSPS / FSFS",
with German Stamp Day stamp (SBK -, Michel 2428), cancelled "10.12.04 53111 Bonn - Limattalphila" and violet add cancellation "Deutsche Post LIMMATTALPHILA Dietikon 10. bis 12. Dezember 2004", bakside arrival cancellation "13.12.04 8813 Horgen 3 Waldegg", address covered in picture, luxury conservation.