I think this could be Richardsons or Webb? Or perhaps American or French?
3.5 inches high.
Red glass applied around the rim.
Rough pontil mark and plenty of ware to the base.
It has a nice orange glow when held up to the light.
Thinking back to previous posts, I think this is called a "fire".
It looks similar to glass found at Great Glasshttp://www.great-glass.co.uk/library/lib2ba.htm
I've bought a UV light and I'm expecting it to come within a few days now.
I did wonder because it has a pale green colour when held up to the light. I wasn't sure if that was normal for opalescent glass as I have not owned it before.