I agree with Bob and I call it a slim trapper but I think back in the day Case used to call them farmers knives?
You're right gino . They were also called a "dixie switch" as some users would work on the backspring to make it a "quick opener" .
I know this thread is not very recent. But, if I may ask, does anyone here "work on the backsprings" of folders to make them easier to open?
I have a four-blade Congress knife that is so tough on my fingernails to open, I don't even enjoy getting it out of my knife drawer.
It's nothing special but, I would like to have the springs weakened, if it's not cost-prohibitive.