Very common in rural Tennessee - I'm sure SandyG can remember them.
Those motors ran many a homestead, and like others pointed out, ran a lot more than the washer.
There is a community that collects and restores old motors - Smokstak. Like VK, with motors. I'd ask over there - lots of good resources.
https://www.smokstak.com/forum/forumdisplay.php?f=59