From my understanding, there were different sets depending on the year. Just from some info that I have says the box number would be 89465.
Some links that would have info you are looking for:
https://web.archive.org/web/20190812...2999/221K7.pdf
http://ismacs.net/singer_sewing_mach...ent_lists.html
https://singer-featherweight.com/blo...-featherweight
Janey - Neat people never make the exciting discoveries I do.
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