[Arran]

I think that the veneer over the arch is like that on a model 81, it looks like some sort of tight grained, blond, hardwood like maple, poplar, or beech. Knowing Philco that's probably what they used since they intended to slap shaded lacquer over top of it, the fact that it's also a thick veneer would also indicate this. The model 89 was a step up from a model 60, which was a step up from a model 80/81, so they used the fancy veneer on the front panel and used the cheap stuff over the arch, whereas the 80/81s used cheap veneer on everything.
Regards
Arran