I think that this tool is a cock fighting spur, a weapon to be tied to a battle cock's leg. Below is a photo that I shot of some spurs, their shape is very similar.
That's one heck of a first post! I can't see it being anything else now.
Amazing! You guys got it!
I never considered pulling the leather handle off.
it was stuck, rusted to the blade, but with a little jigling, it came off,
cleaned it up, it is very sharp, could kill something with it!!!
the leather sheath could be clipped to a pocket like a pen clip. or could be used for sparring practice.