This is a Lightolier table lamp with an oval cased green over white glass shade from the 1920's. The shade is signed in silver on the inside and is hidden by the shade retention ring when installed on the lamp. I have included a photo of the mark which reads "Germany Lightolier". This is a similar lamp to those produced by Emeralite, Verdelite and Amronlite. All of the companies imported these cased shades from Germany, Austria or Czechoslovakia. This shade is specific to this base and it's oval shape is unique to this lamp. The lamp measures 14 1/2" H and the shade is 5"W X 6 1/2" L. This lamp would work well on a desk or night stand. The last photo in the group show a reprinted page from a Lightolier catalog showing this lamp and two other models.