To me it's looks like it's some kind of mechanical part due to the various recesses and collars. Like something attaches to it or it attaches to something.
Could be a yoke of some sort??
Exactly.
Those holes in the base must have had a function. Probably for cooling. I don't think that a cover part would have those. I think these were internal components. Also the weird steps inside the base. Doesn't make sense if that was just a base for standing.
The orange might very well be the cast resin color. Since they needed at least three they might as well have made a mold.
This pic shows that at least on this one there is an opening behind the grill.
View attachment 1339437
Okay what are the hobnails for? I'm not following the other thread so I don't know what you're referring to.
Doesn't have the inner ribbing like the mine or the lamps.