Cubist glass lamp. Old

I have bought quite a few lamps over the years. I found this at a flea swap and could not leave it there . I cleaned it up and started to notice it looked kinda special. Actually, I really like the look of the glass. Judging from the metal and chord I would say 40's 50's. It is a medium green color. Not flashed on. Pure green glass. Kinda thin blown. I think maybe Italian blown? Has anyone ever seen this shape on anything? I am very curious on the maker and help would be appreciated.