what is this?

Can anyone tell me about this? This is a light fixture that is representative of most of the sconces in my house. It has an outlet in the top part.
Was the outlet added? What era is this multiple personality fixture from? What is the hole in the middle, is that a gas line? A cable hook up? (I kid). Seriously though, a lot of my old fixtures have outlets in them and I am totally perplexed. I want to keep the fixture but the outlet is so ugly.
Can it be capped or hidden? Thought?
Thank you kindly.

By hhitchc |