This type of base was made for an Arabian shade but could be adapted for a similar type of shade. Stamped (base): Louis C. Tiffany Furnaces Inc. #15 and the company logo.
Louis C. Tiffany Furnaces, Inc. (New York, NY, 1920-24)
Width 5 Depth 5 Height 13.25 in.
Note: top harp slightly bent. Some wear to patina. Requires rewiring.