Vintage Singer class 15 and 221 sewing machine darning and embroidery attachment set,  Simanco part #160719. This set includes the #160717 sprung darning foot with thumb screw and the #160721 feed dog cover plate. The original instructions and box are included. Very nice vintage condition, clean and rust free with minor signs of use such as light surface scuffs. Box will have typical wear. *Coloration of the attachments may vary from the example shown, may have black or silvertone components.