The one I have was made by Camillus for Klein. I didn't know for a long time that their knives were outsourced. I believe that some of their hand tools are outsourced. I wouldn't be surprised that their hammers are made by Plumb.
However, their screw drivers and pliers are top notch. Their Cushion Grip drivers are about the best, and I must have at least a dozen and a half with all types of bits. I like their diagonal pliers, also. However, my favorite "lineman's" pliers are the ones made by Channelock. I like the box joint better than Klein's overlap. I also have a complete set of their Cushion Grip nut drivers.
My dad was a journeyman electrician for a long time, and I tended to buy pliers and screwdrivers because I trusted his judgement.
I was using one of the Klein screw drivers as a pry bar, and snapped off the blade. I sent it back to Klein with an apology for misusing the tool, requesting re-blade. They replaced it for no charge. That's as good as it gets.
Good quality tools, whether you're an electrician or weekender.