I love Big Jim. Have a bunch of stuff. Need to find room to display them all.
As for the life-like hair Big Jim....
Are you sure it's a Big Jim? Could it be Sport & Shave Ken (1979)?
I got one for my collection, since they used the Big Jim arms on him. (Kinda funny, if you can imagine a large 11 inch Ken doll, with arms scaled for a 10 inch figure.)
For pic: http://www.manbehindthedoll.com/sportandshave.htm