Thanks Mr. Vines. The seller on Craigslist, believed it maybe a Chas. Parker. Here is the full seller's description.
"I have completely restored this vise. It was given a chemical bath and taken down to the bare metal. There is absolutely zero damage or repairs anywhere on this vise. It has a very unique mounting system that only requires you to drill a single hole in your work bench. To swivel the vise you loose and tighten the knob under the counter. You can see it in the photos. This vise is extremely heavy, I don't know how much because I don't have a scale but it's heavy, you'll see. Very well made like they used to make them, much better than any of the foreign junk you see in stores today. This is made to last several lifetimes. It works buttery smooth with great action. I could not find a single thing wrong with this vise and I inspected every square inch of it inside and out. I put fresh grease on the main screw so it's ready to go. This is an excellent deal on a vise you can pass down to your children and their children.
The vise has 3.5" Jaws and opens to 5.5" The only marking on it is No. 7. I believe it was made by Chas Parker sometime in the early 1900's. This is a vise you will be proud to have on your work bench."