Here is a turn of the century brass piano lamp from The Dale Co., New York.
It has an adjustable shade and swivels 360 degrees. The base is a heavy black stone.
Dale Lighting, established in New York in the last half of the 19th century.
Stamped DALE on the shade.
It is in used but working condition. No structural issues, some small nicks see pics for condition.
The shade is 10" wide and 4" diameter, the base is 6"x6" and about 6" tall.