DaveA's TV-123 was mine at one time, it has an interesting history. It was a bear to restore almost as hard as the Philco prototype color set I had. At least there was documentation available for the TV-123.
If you want to see the restoration I did on the 123 when I first got it and closeup pictures of the chassis and cabinet and picture go here:
http://www.myvintagetv.com/philco_tv123.htm
Chuck