Hi, I am looking for help identifying the mounted attachments in the two singers (4&5) and the value of the other three. Is there anyone who can help?

1-Singer 69-8
2-Wilcox & Gibbs “Metropolitan” (992-112) 36321
3-Union Special 52900 B
4-Singer 95-10 (S/N AD020017) with a “Columbia Blind Stitch Machine Co” mounted attachment
5-Singer 95-100 (S/N AE659090) with a similar mounted attachment from “Lewis Invisible Stitch Co”

Thanks.
Walt