A couple weeks ago I decided to look for a replacement for my Prentiss 524 because I had grown tired of the worn jaws slipping on parts. Vise has been in the family for some 50 years at a minimum. About a week ago I find a Charles Parker 974 1/2 at a estate sale and I thought it would do.
I asked how much the vise was and the estate sale person in charge said he didn't think I could remove it (the workbench was a mess) and said if I could remove it, he'd want $15 so I asked him if he would take $7.50.
(Just kidding about the $7.50)
I shopped for other stuff and went to pay for them and told the guy I'd give him $20 for the vise but needed to pick it up on Saturday when I had tools with me and wasn't working. (I went to the sale on my lunch hour, it was only a 15 minute drive.) Person in charge agreed.
I had the foresight to bring a 5 gallon bucket with me on Saturday because a drawer directly beneath the vise was so full of **** that I didn't have access to a square recess which would allow me access to the vise's carriage bolt nuts. I ended up filling the 5 gallon bucket.
It took me less that 30 minutes to remove the vise and then I just dumped the five gallon bucket on the floor.
Took the vise home and stripped the paint and got it mounted. I'm very happy it came with the a Parker wrench that the handle isn't bent because bent handles annoy me.
This photo is in the beginning of the removal process after I took the slide assembly to my car.

Photo below is vise as bought.

Cleaned vise next to Prentiss:

Vise installed: