I have to agree with Coop and Sceva. It is a Ralph Bone knife. I happened to live in Lubbock (1967,68,69) during the time Ralph was actively making knives there and visited his shop, and that, my friend is one of his and a fairly early one to boot, #266. Do your research on Ralph Bone Knives and you'll find your answers. If memory serves, another maker Rob Davidson, using the name "Rocket Knives" kind of took over after Ralph quit and then he (Rocket Knives) moved to the Marble Falls, Tx. area around the mid to late 70's. His mark was an upright rocket. Google Rocket Knives, and Rob may or may not have additional information. Good Luck
Paul