I'd contact the American Rifleman Magazine, and do a search for (mostly yahoo) talk groups about collecting pistols. I'd also contact the collector columnist authors from the gun Mags, like Phil Spangenburger,of Guns and Ammo. You can also ask at much more active forums than this, like CSP forums, Glock Talk or The High Road. I think that there was (is?) a Colt forum, I once had it in my favorites,maybe still do.