Vintage Glass Round Hanging 3 Hole Chain Light Shade.  The is art deco style and is flat with a hump in the middle.  The sides are clear glass with a floral design and the middle is frosted white.

Measures 11-1/2" in diameter x 3" high (with hump) and weighs 3 pounds 15 ounces unpackaged.

The hanging chains are not included and there are some slightly rough outer edges.  There is a flaw on the front of the shade near the hump between the two chain holes (see first and last pictures).  Being sold "AS IS."