CH 1946 F41 Pro Aero subscription letter Special Flight Locarno-Lausanne with vignette

Switzerland 1946 (Air Post stamps - Pro Aero)
Pro Aero Special Flight Locarno-Lausanne of 23.V.46, SBK F41, Michel 470,
Express delivery (subscription letter) cancelled "23.V.46 LOCARNO - Posta Aera" and blue add-on cancellation "PRO AERO 1946",
front side arrival cancellation of flight "23.V.46 LAUSANNE 2 - Exp. Lettres",
backside arrival cancellation "23.V.46 BERN - Telegraph - Eilzustellung",
with yellow flight vignette "Volo postale speciale PRO AERO - Locarno-Losanna",
illustrated cover with address, very decorative cover, luxury quality.