That's no Tron helmet! It's one of the many slight variations of a great sconce shade. White glass to shade and a clear, faceted, window to throw just the right amount of light.
Very good used condition, some dirt and a few micro chips along fitter.
Pair with the Satco 3 1/4" flush mount fixture
Height: 5 1/2"
Depth: 4 1/2"
Fitter: 3 1/4"