“Metal Ball Lamp” in polished brass by Karl Springer, American 1980's. This is an iconic Springer design.
Reference: Karl Springer 1980’s catalog, in lighting section, in upper right hand of page “Metal Ball Lamp” on page 3 of section.
H: 30 inches (height adjustable)
Diam: 17.5 inches
Shade Diam: 26 inches