CH 1953 313 Airport Zurich inauguration FDC german with address

Switzerland 1953 special stamp Airport Zurich (Zürich) inauguration 
on white envelope without address (subscription letter), with german first day issue cancellation "29.VIII.53 BERN - Ausgabetag",
registered mail to Diessenhofen, backside arrival cancellation "31.VIII.53 Diessenhofen", luxury conservation,
Catalog SBK 313, Michel 585.