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!

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[–] 31 points 2 days ago*

It's a Bell 548A jack to be more precise. It's compatible with both 283B (the older square shape) and 505A (the later round shape) plugs

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