This is a Victoinox Champion from the early 1980s. The Champion was the biggest model in the Victorinox lineup, until it was replaced as the top model by the even bigger SwissChamp in 1985. It was still offered in following years and it underwent the usual changes throughout the years (reamer with sewing eye, chisel, hook, etc.).
This one has the reamer without a sewing eye, the old style fine screwdriver on the back, no chisel, a fluted corkscrew and the key ring is on the corkscrew side.