This SAK has blue cellidor scales and has metal inlays on both sides. The front side has the "Telemecanique" logo together with the Victorinox shield while the back scale has the "ALTIVAR 5" inlay.
This is one of the very (very!) few 91mm models (if not the only one) with both the inline philips screwdriver and Technician's screwdriver in the main layer.
The Télémécanique ALTIVAR 5 is a variable speed controller for asynchronous motors. A sample is pictured below (most probably not used together with a wheelbarrow. :) )
MTO user jazzbass for verifying and identifying the model
Schneider Electric - Telemecanique History