Unlisted FDC, likely very rare! Picture of the Federal Palace of Switzerland – (Swiss Parliament  / Bundeshaus) in Bern. Issued: 05.03.1958 with French PM (Berne). Anniversary stamp set 1958 (Werbemarken), including the Salvation Army (bonnet) stamp (SG 590). This particular FDC was a private initiative of a Swiss stampdealer in Lugano. The shop was closed in the sixties, and the stock left untouched until recently, when his grandson discovered these covers.  He guessed that only 5 – 10 covers like this are still around.