I have an an 1880's Gas Ceiling Light with a Hand Blown blue opalescent coin-spot glass globe in very nice condition that was converted to electric at some point. The globe is about 7" tall and about 10" in diameter and the whole fixture is about 21" tall. It was probably hanging in a hallway or small area. I can't find any maker marks on it except for 4 squares stamped at a 45 degree angle on one of the gas pieces.

The globe is about 7" tall and about 10" in diameter and the whole light is about 21" tall.