I recovered a tool from an intersection during the homeward leg of a bike ride:
The scabbard is a bit the worse for having been run over by traffic, but the knife is still in good shape.
The back of the blade has been well and truly mushroomed:
The blade edge doesn’t have nearly as much damage as you’d (well, I’d) expect from all the hammering on the back and sides:
The molded handle suggests it’s a commercial product, but it has no branding, no maker’s mark, no identification of any kind.
Google Image Search returns useless views of tail lights and rifles. Here, try it for yourself:
I have no idea what it’s used for.
[Update: It’s a Bell System Cable-Sheath Splitting Knife, made by Klein Tools. More details in the comments … ]