Prior to 1975, Victorinox used scissors with a single, slightly bent spring, and with the two halves of the scissors attached with a small, adjustable screw. The blades were slightly more angular, particularly around the pivot.
Like most Swiss Army knife tools of that era, the vintage scissors have a nicer polish to them, then modern ones. It appears they may have been plated with a harder metal.
The older Victorinox scissors sometimes need to be adjusted. If the blades are too "floppy", use a small screwdriver to tighten the screw a bit. If the blades are binding, then loosen the screw about 1/4 turn. You might want also to put a drop of mineral oil at the pivot point, about once a year.
All Swiss Army knife models with scissors, before 1975.