02-16-2017, 08:20 PM
They could be molded out of some Urea based plastic, like Plascon, I don't think I've seen ivory Tenite knobs on a Canadian built Philco before, most seem to be brown or caramel coloured. To me the marks on those knobs look like burn marks, like someone burned them with a cigarette, Tenite usually warps, shrinks, and or cracks.
Regards
Arran
Regards
Arran