Vintage Singer sewing machine adjustable zigzag attachment with optional edge guide, also comes with a new reproduction instruction manual. For use on low shank machines including the 15, 99, 66, 101*, 127, 128, 201, 221 / 222K Featherweight, etc *Mount using the upper hole for use on the model 101. It is in very nice vintage condition, clean and rust free. Genuine, original Simanco attachment, part #121706.