Just in Northern California I know of at least 3 baseball autograph collectors who were trying to "get 'em all" and though I've lost touch with them I think they are still around.
There are also at least two guys who were heavy in-person collectors and both never sold or traded anything. I would think if those collections are still intact they'd be quite a find.
One of my personal contemporaries I also lost touch with, Richard Masson (last contact was in Southern California), had already amassed quite a collection just into the late 1970s. Has anyone dealt with him recently?
I think there are quite a few nice autograph collections out there but Jim probably knows best where they are