Yes I saw that someone had found two of them. I do collect porcelain insulators and I do collect ones made by Illinois Electric Porcelain. I worked there in the 1970’s when it was McGraw-Edision.
Fenndango has pretty much got it on what it is. I am coming up with it being a U-620 also going by the pictures without knowing the dimension. The new value guide has it at $10 to $20.
Looks like it could be the globe part for a wall mount coffee grinder. One end would screw into the metal grinder part. The other end would be where you poured the coffee beans into.