Rise: can you post up some pictures of the Parker? if the jaws are in great shape it has some value, and if they need replacing that is a big expense and would knock down the value a lot. you can't really put a per pound amount on an old vise, but without pictures it's hard to help you if you are really needing some for a friend.
also where are you located cause that makes a HUGE DIFFERENCE? if you are going to remain a member of the forum after you get a free appraisal on the vise you might want to go in your GJ profile and put in your area. also click on Avatar and download a picture so it will show up under your name like my Bison made of scrap steel and tools does under mine.
good luck