Turned so that looking from the top with the point going forward it could be a threading bit for a lathe. Does the point come together at 60 degrees? But no clue on why it was cut that way, I always ground mine leaving all of metal there, not some little skinny thing that I could break that easy.
I bought here in the forum on the marketplace one classic air graver it was this tool
the seller is a gun master engrave I asked him what this tool is, he has responded to me for everything! his email is no longer available 'but he is a participant here in the forum and if he maybe he can read here give us an answer.
The picture makes it appear to be wider at the tip then next to the shank and I can't see a relief angle on the top. It also looks like the top of the tool may be flat and in line with the body of the tool (I didn't say that right; meant "straight"). (?)
I'm thinking some sort of a plunge grooving tool to be used on a lathe. How large is the tool? Are there any tell tale marks further up the shank that could give a clue as to how it was held?
Mrthe may be closer than the rest of us on this graver. Unless you have gearing to engage when threading, you'd never 'chase' a thread by hand. Also, the grinds aren't quite right for threading reasons, and the tip seems to exceed the normal dimension of 1/8 x p for the usual coarse thread. Could be a texturing tool of some kind, as certain clearances don't seem to be there.