i can not find anything about the info u ask for... all it tell me in the book it called a Singer buttonholer no.160506, "This attachment is intended for use on SINGER Lock Stitch Family Sewing Machines and produces neat and durable buttonholes in a great variety of fabrics without any speical skill on the part of the operator. The buttonholes are produced in a fraction of the time required for hand work and they are firmer and more even than those made by hands."
On the 2nd item is Singer Blind Stitch Attachment 160616 "For invisible Hamming on SINGER lock stitch family sewing machines" " This useful Singer attachment produces invisible hemming with perfect blind stitches on an almost unlimited variterty of work such as skirts, dresses, lingerie, children's clothes , curtains, towels, sheets , table cloths and many other articles. It is quickly attached to your sewing machine in place of the presser foot. It is easy to use and will enable you to accomplish superior invisible hemming much faster and with less effort than is possible by hand. "