Interesting find. I found a Magnavox roundie in a similar situation a few years ago with a nice bright original CRT. That Dumont CRT mask looks very familiar. Now I know where Heathkit sourced the mask for their GR-295 sets. I built one in 1970 with the remote option and it lasted to 1984. It is all gone now except for the manuals and the remote. There is a GR-295 photo in this thread (not mine):
http://www.videokarma.org/showthread.php?t=255398