Vintage Singer sewing machine adjustable zigzag attachment, comes with the optional edge guide along with the original instructions and box. For use on low shank machines including the 15, 99, 66, 101*, 127, 128, 201, 221 / 222K Featherweight, etc . It is in very nice vintage condition, clean and rust free. Box will show typical signs of age. Genuine, original Simanco attachment, part #121706 *When used on the model 101, use the upper hole when mounting