Vintage circa 1920 , Sheffield styled Industrial Lighting Shade , bowl shaped Hand blown in the Iconic Sheffield ribbed pattern , wending with a double pointed scalloped bottom edge . Specs of this shade :

2 1/4 inch lip fitter

6 inch bottom diameter

4 3/4 inch high when measured down thru center

Great vintage glass lamp and lighting restoration or replacement pieces . Free of chips or cracks some rough areas on the fitter neck from use over the last 100 years . The shades are white translucent glass , often called clam broth ,