Anybody know what this is

[Tubejunke]

It looks military to me. It looks like it mounts into a wall console in array of other possibly related equipment, like on a ship. From behind it looks like a student lab kit from National Radio Institute, circa the mid to late 40's. I had a similar item and sold it sight unseen to a collector for $700. I figure if I got that much then either the man was eccentric and rich, or it is really worth ten times what I got. I still have the complete N.R.I. correspondence course material. Really cool reading. The guy it belonged to graduated and ran his own TV repair business his whole life. Then he died and his wife threw all of this stuff out on the curb. Luckily, a fellow techie recovered a lot of it and gave it to me...