I have older Singers, one Kenmore, and one White, all pre-1980. They are all solid, reliable machines, and I would recommend any of them. Things to look for: bobbin, bobbin case, good wiring, controller, necessary attachments, and a user manual. Also check to see that it moves freely, although some frozen machines can be unstuck with a good cleaning/oiling. I would pass if there was obvious rust or a lot of missing paint, unless you plan to repaint.