The Back-Side Phillips is the most common version of the Phillips screwdriver on a Swiss Army Knife.
A #2 Phillips driver located on the back of the knife in the same location that the Corkscrew is located on many models.
Some models of the Swiss Army Knife differ only by their inclusion of either the Back-Side-Phillips or the Corkscrew, as the design of the knives/tools does not allow both to be included.
The Phillips screwdriver was invented by Henry Phillips in the 1930’s with the intent to provide a safer alternative to the traditional straight-edged screwdriver. Henry Phillips wanted a screwdriver that would prevent a damaging process called over torquing. This feature is also its weakness.
Victorinox
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Back Side Phillips, 1992 version
Can Key Usage Illustration
Early Back Side Phillips Square Shank with File
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The Back Side Phillips is available on both 84mm and 91mm models.
There has been at least 5 versions of the ))Back-Side(( Phillips screwdriver produced (Recent research indicates the number is closer to 8).
The older models have a squared off shank rather than round or cylindrical one used today.
Quite early vintage versions have a File incorporated into the inner flat side, and might be slightly larger than the current, a #2 size, Phillips.
The current tool is slimmed down from past versions and shaped to fit a wider range of screw heads.
Somewhat later versions of the Back-Side Phillips had a slot cut into them to create a Can Key, which is used as a key to open food tins designed specifically with a compatible opening system. These tins were quite popular in the 50s through the 70s. The ))Can-Key(( was available on both round a square versions of the screwdriver; it is now discontinued, but can help in dating an older model.
See also: The In-line Phillips is another common version of the Phillips screwdriver on various models.
See also: The Can Opener has a Slotted Driver tip that is also designed to be used with Phillips drive screws.
See also: The 58mm Cap Lifter is available with a small #00/#0 magnetic Phillips.
See also: The Bit Driver is the most recent Phillips screwdriver that can use several hex-drive Phillips, Pozidrive, and other bits.
Wenger
Info to be added