American Table Lamp, possibly Gorham or Morgan.

Leaded glass shade on a base made by Reed & Barton, marked B30. The owner contacted Red & Barton and they said that the company used 2 makers for their leaded shades, they did not make their own shades. From what we currently know, some shades made by John Morgan & Sons of Brooklyn, and Gorham of Rhode Island occasionally appear on Red & Barton bases. The aperture size is 2 3/4".