We were looking at the machines at my father in law's house (he passed in October, MIL passed in 2012) and the Singer in the living room was manufactured in 1894 based on the serial number. I almost passed out!
It's been well used, but still works and has very little rust. Still in original cabinet from what I can tell and there's a box of attachments that are super old. Just needs a belt and a good cleaning, possibly a timing adjustment. I was really salty that my cousin let my great grandmother's treadle machine rust on her back porch, but I'm glad to have another antique Singer in my care and keeping.