I bought a old vise. Cant seem to find the worth on it. Only thing it says is Parker and then 375. Weighs around 150 pounds. Jaws are 6.5" opens 9.25" probably 4" deep
I would say that would be $100-150 at a garage sale in the Chicago area. The jaws have some big chips, and old-style fixed base (swivel jaw or not) is not so desirable. New jaws on a big Parker could easily cost $200 to replace. Once cleaned and restored it could easily be worth over $500 to the right collector.
If you read enough, "What's it worth?" vise threads, you'll see that value is heavily dependent upon where you live. Even around here where vises are plentiful, 200 is still a decent buy on a vise of that size and quality.