These Spook Lamps almost never come up for sale, especially in this great condition. I am surprised it didn't bring more. There is a larger version measuring 12" high with a 6" shade and a 4.5" wide base. The patent date on these lamps is February 14, 1911, although I don't think they were immediately released. Still, I think they predate 1920. The one on page 188 has some different panel designs than this one.I feel the buyer got a solid bargain.
Mark B. Ledenbach's vintage Halloween collectibles blog.