It's been awhile since I have been on here and just reading the comments regarding the 15-91. I have one that a dear friend gave me last October. Martha is 81 years old and had this machine since she was 12 years old. Her parents gave it to her for a birthday present. It's in the original cabinet when she got it, all attachments, manual, stool and it's got the knee bar. I haven't used the machine yet since it's in need of a new power cord and foot control. This is a cherished gift and I will pass this onto my great granddaughter. Plan on getting this back to working by spring of this year (2019). The machine itself looks like it has been rarely used but Martha made her clothes and daughters for many years.