The diameter of the base at the bottom is 11.25 inches. The underside of the base has an x-crossed cast iron counterweight screwed into a threaded iron pipe going to the top. I did not take the bottom apart to look for any markings.
Unique did not mark their bases or shades. The shade has a grape vine motif going around the bottom and has 6 rows of an in-line brick pattern above. It resembles a John Morgan shade shown on Leaded Lamps. Com, but that is up to you to verify. The shade is 24" in diameter and is 11.75" high.
The shade is in excellent condition and has approx. 11 hard to find breaks of glass, all towards the bottom of the shade. There are more than 600 pieces of glass to this shade.
The finial on the lamp is not original but has a glass ball grape? On top and somewhat goes with the motif. It is a beautiful combination and will impress. I will drop it off if you choose either of the latter two.
I will photograph the base and shade at drop off. The item "30 Antique Unique Tree Trunk Lamp Base + Grape Leaded Shade -possible shipping" is in sale since Tuesday, March 3, 2020. This item is in the category "Collectibles\Lamps, Lighting\Lamps".The seller is "pantsismyname" and is located in Lake Forest, Illinois. This item can't be shipped, the buyer must pick up the item.