Found this beaut at a gun show. 4 1/2" closed No lock, the back spring is tempered in such a way that the blade is as hard to open as it is to close! File work from the tip of the back spring to the end of the thumb ramp.Box wood handles held down by three brass pins, brass threaded bolster and liners. Touch mark looks like a Lilly. Blade was tarnished black and 'brightened' by me.