I got a first answer from the Swissicon Army Journal.
The guy was born in 1918. His name was (I imagine he's no longer among the living) Stettler Johann.
He was a "Supply Soldier" in the 17th supply company.
All info were clear, but the Vpf. S., which stands for Verpflegungssoldat.
His address is Thun, Mittlerer Strasse 25 (might be this building, as I found on Google Maps).

The questions I raised have now been passed on to the chief Director of the journal to see if he can find further info.