Can anyone tell me about a knife I just bought? It says "A.B. Russell" and "Springdale, Ark." on one side of the base of the blade. On the other, it says "CM-4 Germany." On the blade itself is an etching signed "Shaw-Leibowitz." On the handle is a number, like it was one of a limited series. It's small about 4 inches long when closed. Does anyone know when it was made and why? Value? Any info at all would be appreciated.