Wow, what a neat radio! Looks like an exciting project, and best of luck with it. I have to agree with Reece -- it looks to me like that aluminum-can electrolytic that was hot-glued under the chassis is not original. That particular one appears to be 60's vintage.
In case you're interested, here's a guy that sells reproduction dial escutcheons for your radio (390X?), and also knobs and pushbuttons, though yours look fine from the picture. A tad pricy though, at twice what you paid for the radio
http://www.antiqueradioknobs.com/partlistings.html
Paula