Just recently found a "Blue Chip" myself. I've been working on it the last few weeks. My backglass is a little flaky, but reasonably good. It was missing the back door on the head and had no paperwork or cash box.
It's almost finished, and will be a very nice example when I'm done. I'll probably be offering it for sale and if it isn't sold by then, I'll be bringing it to the Allentown show.
Great find, and welcome to Pinside!