Well I visited this vise tonight and decided to buy it! The jaws are 5" and in good shape. On the large side panel you can see faintly "Parker Vise Div", "Union..." so it's definitely the same origin that SkyPuncher described. I do see a 975 possibly followed by a letter on the bottom of the swivel base making it a Union/Parker 975. Also the swivel wrench is intact and labeled as Chas Parker. I didn't have a scale handy but it is one heavy vise. I've included a few pics. Would anyone happen to have a link to a Union era Parker Vise Div. Catalog? Again, thanks for your help!