Read the "Vises of Garage Journal"...
There's 881 pages of knowledge, and general stuff, that you can't get anywhere else...
GJ member "Balane" has a Craftsman 5197 on Ebay that will fulfill 99.9% of your clamping needs...77 pounds is a stout 4 1/2" vise...swivel base, too...no reserve auction...ergo---fair price for a restored classic...see attached photos...
If you were looking at "good", as opposed to imported el crapola, new vises, the prices would range from $ 500.00 up...i.e....Wilton 450S....Over $ 800.00 from Amazon, and "only 71 pounds", they have a rabid following and, used, command higher prices than most old iron...
If knowledge is what you're after...there's 881 pages of it...right here...