Switzerland C46, 2fr 50th Anniversary Issue of 1st Alpine Flight by Oskar Bider Event Cover, stamp was only valid for postage on July 13, 1963 on flights Langenbruck-Locarro-Bern. They were sold between June 1 to July 13,1963 with proceeds going to Pro Areo Foundation. Cover has pre-printed address and official PTT cachet and almost pristine condition - a slight crease upper right cornre. Tied to cover by 13.VII.1963 commemorative pmk. Small imprint lower left corner states "FDC PTT". Nice aviation history cover (Image)

$15