[Arran]

I think that the shoulders and the bottom of the sides was black to match the grill, at least it looks black to me. Two of those spots on top look like burn marks, not sure about the third, maybe someone liked using this radio as an ash tray? Maybe a little scraping and spot application of bleach will fade the burns a bit? Sometime sanding will all but get rid of minor burn marks.
Regards
Arran