I have a very old Gerber Folding Hunter with brass framed wooden scales and I don't know what steel in the blade, but it holds an edge like mad and is hard as Hell to sharpen. I also have an old Gerber bolt action folder, a really very nice little knife, that has a steel in the blade that is a bit easier to work. Finally, I have a Gerber San Francisco Bowie from the late 1980s, a very nice piece but for the rubber hilt on it. I may have one or two others, but that is about it, IIRC. I had a Parabellum that I sold for $150 a couple of years back. That was the knife that was once described as the first megafolder.