I moved into a house built in the 1950s in the north eastern US and this outlet is on the back of the house but I can’t find anything like it searching online. If anyone knows what it is I’d greatly appreciate the enlightenment!
What you’re likely seeing as “4-pin” wiring is a 4-conductor cable (two hots + neutral + ground), used for 240V circuits like electric dryers, ranges, or central air conditioners.
Outdoor? Looks more like a vintage telephone jack.
Absolutely is
You know, now that I think about it I agree. I was a kid in the 60’s and I think I vaguely remember them now that I dwell on it.
Boy, is that and old memory to dredge up…
Type 505A telephone jack. You can see one in this wiki under History.
OH, that’s the name and not the current rating! Pick up there phone, it’s fucking Zeus!
Back in my day, our phones were powered by the wrath of Zeus. We had to anger him BOTH WAYS to get some lightning to call and hang up.
I ran across 18v AC of his wrath stripping one side of the phone wire with my teeth on a scheme to capture and store \ use ring voltage to power devices. Free electricity you know.
Pocketbook empty
Can’t afford a cell
Looking for juice
Found a bottomless well
No stripper, no crimps
Used teeth on the shell
Now my heart’s all aflutter
With the touch of Ma Bell
I wonder if the house has a pool. I imagine someone wanted a phone on the patio table by the pool. That seems iconically 50s to me.

I have a relative with a phone by his pool
He uses an old rotary phone for it, because it’s all pretty basic electromechanical stuff that can’t really get messed up from it being out in the rain or whatever. It can’t make outgoing calls because modern phone systems don’t work with rotary phones, but it receives incoming calls just fine
It should maybe be noted that he’s an old school telephone lineman who really knows his stuff, so I don’t know if there were any other adapters or anything needed to make his setup work.
No additional adapters needed. Other than touch tone (button pad) vs pulse (rotary dial) and the shape of the plug, landline phones are pretty much the same as they were in the 30s. Everything between them has changed tremendously, but the phone on the end of the line is very basic.



