Lancaster Antiques has dated this piece to the 1920s.

It measures approximately 28" (71cm) in length and approximately 26" (66cm) at the widest point.
Swags of glass drops come down from the ceiling fitting to the brass rim and rows of faceted glass underneath form the bag shape with the original glass ball underneath. Some of the drops have new wirework to secure in position.
Lancaster Antiques has dated this piece to the 1920s.
You can view the stock and full dealer information on the Lancaster Antiques Profile Page