"One enterprising eBay seller has lifted the Singer ID Chart in the Files section and embellished it with photos (and links to her eBay store). This is closer to the product I had in mind when I started the project but lacked the time and talent to accomplish it. I haven't checked for errors or missing models." As posted by the owner of the Yahoo Vintage Singer group list. At least they are not trying to sell it.
Worth looking at to identify machines.