I found this thing along with a couple other items recently. [id=513213509]. It is one piece, 2 7/8" tall and 3" wide at the base, and unmarked. There are four unglazed firing rests on the top(?) and four glazed indents or recesses around the outer base(?). The glazed interior is fluted or scalloped. Color is dark brown and looks very much like the glaze I've seen on a lot of CHANCE signals.
Does anyone know what this is? Is it even an insulator? Thanks for any info.
UPDATE: Nathan S. replies that this is a neon sign support. He provided this link to another one with the hardware included: [id=178617368]. Thanks Nathan!