Vintage Singer sewing machine low shank adjustable zipper / cording foot. This attachment is compatible with low shank machines including the 15, 66, 99, 101, 127, 128, 185, 192, 201, 221 / 222K Featherweight, 306, 319, 328, etc. Very nice vintage condition with typical signs of use, clean & rust free. Genuine, original Singer accessory, marked "Complete 121877 USA"