Prior to 1975, Victorinox Swiss Army knives came with a partially square Phillips head screwdriver, which also had a file cut into one face of the shaft.
Uses: You can use the square Phillips screwdriver to drive any Phillips head screws. The only difference from the modern version is that it fits more cleanly into its knife slot, so it is less likely to fill up with pocket crud.
This version of the Phillips screwdriver also has a file which you can use on fingernails, or other soft materials.
This tool was common on 84mm and 91mm Victorinox Swiss Army knives before 1975.