I remember my great-grandmother teaching me to sew on her Singer 15-91 when I was a little kid.
After she passed away, my grandmother (her daughter) inherited her sewing machine. Over time, it was stored away in her basement. My grandmother sewed (a LOT), but had upgraded to newer machines.
My grandmother passed away earlier this year, and I inherited all of the sewing machines, including the Singer 15-91.
I treasure all of them. The Singer needs rewiring (looks like the wire casing has dry-rotted), and it needs a few minor parts, but I bet it'll still work. In the meantime, I bought one just like it off eBay so I can learn to use it until DH has a chance to fix my great-grandmother's machine. :)