Don't know about the vintage, but Clyde Armory in Athens has one on the wall (or did a couple weeks ago).
They had a transferable M16 hanging on the wall in there at one time with a $30k price tag on it.Thanks. I've got to go over that way this week. I don't have anywhere near the money for one, but I'll stop in and dream.
I used to go in and stare at it, but I was afraid to touch it.
I could just see me dropping it, the lower shattering and then me having to sell my house to pay for it.