Nice find! Another BIG clue - it has the old FM band. You can listen to baby monitors and your neighbor's cordless phones, maybe some fire departments still on the low band...
There are Philco service bulletins on my web page - look at model 42-390.
http://www.audiophool.cjb.net/Philco.html
PUT A FUSE in this sucker! The 6X5 rectifier is infamous for shorting and taking out the power transformer!