Originally Posted by
Charles Wahl
-- it's obviously some sort of phenolic (fabric-reinforced sheet with a polymer resin), most likely what's called G-10 or Garolite (epoxy is the resin, typically, and I think fiberglass the fabric for most varieties):
https://www.mcmaster.com/phenolic/
Phenolic has been around for a long time, and I think much of the earlier stuff used cotton fabric, don't know about the resin -- maybe
bakelite?
It appeared to be bakelite to me, too, but I believe that stuff was played out by the mid-70s?
Thanks for bringing phenolic to my vocabulary; I'm almost as excited as the day I discovered what an aglet is
DD