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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[–] 45 points 2 days ago (2 children)

That was what we used for phone jacks before the current standard. It takes a square plug with 4 matching posts. We had one growing up.

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