The info wore off the grip and I do not recall what it was. I think it was a German brand. These have been one of my favorite tools for a decade. The jaws are much more narrow than what is typical for side cutters and these handle like a surgeon's scalpel. Best of all, they can be sharpened many many times. Unfortunately, these are getting close to end of life from all of my sharpening and pivot pin wear. I want to get another set, but I have never been able to figure out the brand to find them again. They were given to me by a tech for a computerized Guru bicycle fit machine we had installed in one of our bike shops in 2012.
The handles are a little chunkier than yours but Knipex makes some high quality replacements.
https://www.knipex.com/products/electronics-pliers/electronic-super-knips/electronic-super-knips/7803125
I have several. The orange handled ones are likely most similar to Knipex. These are much more clunky though. They are good for many things and are much more sturdy for things like house wiring. The ones I asked about in the post are much smaller feeling in the hand. They feel like a precision tool unlike any other side cutters I have used. I can strip enamel off of magnet wire with just the hand feel of these when they are sharp and new. The ultra thin handle profile just works in really tight spaces, like putting my index finger on the rivet to hold the jaws on the flat surface and fingertip touching the handles together without gripping the handles. They feel light and well shaped like this type of mobile dexterity was by design. The guy that gave them to me only had very high end tools and was out of Europe.
Bottom row are super useful. I almost never use the tops