Help ID this mystery jack

Factual Questions
1

A mystery jack was found in the wall of my house (built in 1928) above the baseboard. The front appears to be an approximately 1/4" diameter input jack; the back is porcelain. Two cloth clad wires were connected to it: one connected to the back of a metal single gang electrical box (I believe this was used as a ground); the other wire goes up towards the ceiling/roof (this one has no power running through it and I do not know where it terminates). It was covered with a single hole plate like you would use for a coaxial cable. Here are some pictures:

Imgur

Imgur

Possibilities:

  1. old telephone jack
  2. old antenna jack
  3. old cable TV jack (<– highly unlikely)
  4. something else

Has anyone ever seen anything like this?

2

Wild guess, but it looks like an antenna jack from the golden age of radio.

3

Maybe an antenna connection for Ham Radio?

4

an antenna jack for AM radio receiver would be my thought. FM and TV antenna jacks were different.

5

Looks like a 1920s style antenna death jack is correct.

6

Good work guys, especially ZenBeam for the pic.