I picked up a wonderful Singer 99K (1956) at a barn sale for $20. It sews the greatest, smooth, even straight stitch I've ever seen. It was well cared for, clean, cord was not frayed- a great find and a machine I love. People have gone a little crazy where featherweight s are concerned. If you really want one of those I would have to see it before purchase- clean? Attachments in their box with it? Case in good condition? Cord not frayed? Everything that should move/ turn does so smoothly? In other words, is it in good enough condition with everything that goes with them included and how much are you willing to spend? I spent 3 years looking around for a second machine, couldn't be happier with my $20 find.
Not a featherweight but a great straight stitch vintage machine