Does anyone know what this is? Found while hunting for bottles. It does not look like it has broken off from anything. The edges are very sharp on the one side.
Thanks cowseat I did some more googling about your suggestion and came up with this. Radio Strain Glass Antenna Insulator. IT sort of looks like it could be a piece from that but Im still not sure. My piece doesn't look like it broke off from anything although it does have rough and sharp edges.
This is just a guess on my part, but it might be a shade or awning ring. I've only seen them as a smooth ring, never with the two little extensions yours has, so I could be way off.
Here's a photo showing what I'm talking about (on the right)
I have seen a photo of one in use, but I can't locate it at the moment. Something like this ring would be mounted in the center of a porch ceiling. All the cords controlling the porch shades would be strung through the ring(s) and tied down in one location. The user could raise/lower all the shades at once.