The other day I saw some old looking decora style duplex receptacles. They had three lines on the face and looked like may have been different size from most decora. Brand was Slater. I may pick them up if anyone wants pictures. Guessing these were very early decora.
Also some some old Sierra cover plates in weird colors, they had gray and white, which seems more modern than the era the plates were from.
Here are some decorator devices I have that I thought you might be interested to see. The switch is a Circle F No Klik. I've never seen a decorator switch built this way, there's no frame around the paddle and you can see the mechanism behind it.
That desbar style I've had for several years. I just got the other two. Habitat Restore has been a good source for this stuff, these all came from there.
The Circle F and Sierra both have green grounding screws. The Sierra also has push in wiring option also. It seems to be a Spec Grade item because it's quite well built and seems to have brass mounting strap. I've also not seen a receptacle to have the voltage and amperage on the face as it has. When did Sierra stop making devices? I remember they too had a desbar like receptacle but it fit a decorator plate that was narrower.
There were three of the Circle F rockers, and all seemed to be NOS. I just got one though.
Circle F later became Sylvania Wiring Devices, and the last was Challenger, maybe Westinghouse killed them when they bought Challenger as they already had Bryant wiring devices, Bryant was later sold to Hubbell.