In the late 70s, Gerber made a version of their "Folding Sportsman" which
used VascoWear as the blade steel. They were HTed to 57-59Rc.
They were marked "V steel" on the back of the ricasso.
Gerber stopped using VascoWear in the early 80s. They show
up in the used market only occasionally.
Very good knives.