I couldn't find a date on it, but judging from the mount, shade, and other components my guess is circa 1930's.
The lamp works!
Great shape to the shade.
You may have already noticed it's mounted to a wooden box with an outlet... it works! Great ingenuity from the original owner I suspect.
The cord (original) is approximately 9 feet in length.
As photographed the lamp is 35" tall, but can extend taller using the knuckle.
Weighs 21 lbs