This is not a weapon (the weapons of war are unfortunate instruments) – it’s a Japanese-style box cutter, a “kiridashi.”
Doing the angled grind is a lot of fun; to look right it’s got to be very straight. And, as you get close to the tip, it becomes very thin and you have to proceed with caution (and lots of dips in the water of cooling) to keep from burning the metal.
That’s from the billet that I ground and smashed. It hardened really nicely, too – around RC 60, which is a bit crunchy for a regular knife but for something that’s basically supposed to be a scribing-blade, it ought to be OK.
Technically, I should have put it in a vise and whacked it sideways with a hammer a few times to make sure it didn’t snap. I just can’t bear to do that yet. Soonish, I’ll make a few billets I can carve testing-blanks out of, and get all the quenching temperatures and tempering process tuned up. But I am not yet at the point where I feel cavalier enough about my stuff to start smashing it.