Here is one I picked up not long ago from a guy who bought it at an estate sale. I got it for $80 and after getting it home I have realized it is in near perfect as new condition and sews like it is brand new. What a lucky deal.
Built 1952 in New Jersey a Singer 15-91. Came with the wicker box you see in photo and was nearly full of just about anything you could need to sew with on this machine. Stool had about 60 or spools of thread. All the attachments are like new. I imagine I will pass this on to one of my grand kids and it will still work like new.
What amazed me was that there is no part that is not available for these old machines. And the manuals for everything from Sewing for Beginners to Maintience manuals are available for free off the internet.