Thank you sorch.
This is an import toolmakers vise I bought years ago from Victor Machinery Exchange. I checked the accuracy with a surface plate and found it was better than their +/- 0.0002" spec. It is precision-ground on all the surface hardened parts. I see Stefan Gotteswinter uses a similar but larger vise for milling work on his YouTube videos. If I had to buy again, I would have bought the same style vise but one with a lateral slot milled along the longer sides like this vise has on its ends. This would make clamp the vise at any angle a lot easier.
Thank you for looking,
Paul