Apparently it belonged to my mother's mother. We think she got it at a garage sale. There are the initials E.F. scratched into the underside. I don't know how many owners it has had.
I cannot wait to play with it. Mom swears it still works, so we'll see. I already looked up and downloaded the original Singer manual (they have free PDFs online) so I'm all set for cleaning it and oiling it and lubricating it (those ARE two different things).
This is one of the coolest things ever.