What is this cutter?

[amecks]

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. 

[skipskip]

leather?

[amecks]

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.

[lptools]

Seems it would be hard to use as a scraper. A scribe, or some sort of marking knife?

[Catch22!]

From the shape of the ends, it looks like a lathe tool.

[Chillylulu]

Windshield knife?

[skipskip]

maybe one of X-acto's odd hobby knives?