Hefty aluminum handle cutting tool. The knob unscrews to remove or adjust blade. The blade is 1/8" thick, both ends are ground to point on both sides, angle end and rounded end. No markings at all on blade or holder.
(https://i.postimg.cc/phVytf9y/IMG-9949-01.jpg) (https://postimg.cc/phVytf9y)
(https://i.postimg.cc/JDT07sJx/IMG-9950-01.jpg) (https://postimg.cc/JDT07sJx)
(https://i.postimg.cc/XBpJrnkb/IMG-9951-01.jpg) (https://postimg.cc/XBpJrnkb)
(https://i.postimg.cc/9zMz8B5n/IMG-9952-01.jpg) (https://postimg.cc/9zMz8B5n)
leather?
Yes. If we don't know what it is - its either for leatherworking or a nutcracker! Maybe its a nutcracker? Smash the nut with heavy handle then pick out the nutmeat with the blade end. But really, it could be for leather. The blades aren't ground like a knife, it's too wide an angle. And if it was a scraper it would only be ground on one side.
Seems it would be hard to use as a scraper. A scribe, or some sort of marking knife?
From the shape of the ends, it looks like a lathe tool.
Windshield knife?
maybe one of X-acto's odd hobby knives?