Possibly Fostoria Specialty Company (Fostoria, OH, 1899-1910) or Steuben Glass Works (Corning, NY, 1903-2011)
An antique Art Nouveau art glass, floriform lamp shade with a ruffled edge. It is decorated with green dragged loop with a gold band on an opalescent ground with a gold interior.
c. 1910 W 4 D 4 H 5 in. Fitter: W 1.25 in.