here in Ohio,most people put high prices on their bullets. Id pay $200 for that one you have posted if you planned on keeping it for personal use and not try to flip it. The base you could prolly find for $30-70 somewhere. I think c1s are the perfect size shop vise. Not too big or too small.
That looks like a 40's model with the double pins holding the pipe jaws, and the bases are harder to find. I have the same one on a shelf because it sits too tall to comfortably use on a modern bench height. I think it might actually be a better user vise without the swivel base.
I think there's someone on Ebay listing the swivel base that has the two claw feet for the swivel locks, rather than the circular ring style. That's the style the older models use, right?