Gorgeous art glass shade we discovered in a turn of the century home we lived in nearly 50 years ago.  Diameter = 7.5" Height = 6"  Fitter = 3 3/4", though it does fit a standard 3 1/4" fitter.  We believe it to be by Loetz as there is another listing on Ebay for two duplicates by a competent seller who has authenticated his own.  We've collected original shades for years and feel equally confident in this conclusion.  It is for sure an antique as well as a gorgeous and unique art glass shade you'll be proud to display in your home.  Hang as a pendant or perhaps use inverted for a table lamp.  As you can see in a couple of the photos, there appears to be some remnant gold leafing or residue paint in the recesses of the bubbles that may have been part of an original finish long ago removed.  It can easily be removed if not original, but we didn't want to disturb it until a professional assessment was completed.  There are several minor chips on the collar and far smaller than you'll see on most.