Vintage Singer buttonhole attachment. This buttonholer is compatible with low shank models such as the 15, 66, 99, 127, 128, 201, 221 / 222K Featherweight, etc. This set includes the #121795 buttonholer, throat plate cover, thumb screw and original instructions. Very good vintage condition with minor signs of age, clean & rust free. Please note that the original manual will display wear. Original, genuine Simanco attachment.