To be fair, if you can somehow find a broken vise with the correct size handle/screw, and vise nut, (if the vise nut is also missing), you might actually end up with a decent vise, since presumable the original screw and/or vise nut broke well before any injury happened to the main cast parts.
The dynamic jaw, stationary jaw, and swivel base and components all look to be in fine condition, other than dome rust, and I don’t see much in the way of idiot marks on the top of the jaws.
The form of the castings actually look like a nice semi-clone of the Wilton bullet design.
Admittedly, this is based off of one crappy photo.