[Arran]

 Believe it or not those black plastic American Condenser Co. electrolytic cans go back further then you think, I think they may be molded out of black Bakelite actually. They are obviously not original to a model 37-690 or 680 Philco but they were the original type of capacitors used in some Addison models in the late 1940s, at least the ones that had a common positive, the filter choke was on the negative side like some early 30s radios. This does not make them worth anything more then any other dead electrolytic can, the Catalin collector types don't seem to care whether their sets actually play or are all authentic inside, but I'm not a Catalin collector I just like Addison because it was a smaller Canadian manufacturer. I found one that someone had stuffed into a disused hole and used as a replacement in my Telesonic Medco radio, which used to have a cardboard one under the chassis, it's going into a wooden Addison when I get around to it.
Regards
Arran