Vintage milk glass reflector shade, a good replacement shade for a Rembrandt or Stiffel type lamp, floor or table lamp. Size is 10" across the rim, 5 1/2" deep overall, 2 7/8" across the fitter.
This is in very nice condition without damage, does have a makers flaw streak in the glass visible only on the inside. It's near the fitter, and does not show when light shines through it.