UK Cream Buttonholer Attachment, Vintage Singer theme-animal (Click here to learn all BOO-FRM20897-157 Model:99K EL1771 indicates an original bundle

(Click here to learn all about the significance and scarcity of the Red S Featherweight

but would have been ordered as a specialty sewing item from the old

The Buttonholer was priced at $8

(Raising the stitch regulator so that it sticks straight out or parallel to the floor will cause your feed dogs to neither go forward or backward and stitch in a stationary position

I've included several photos of the process

UK Cream Buttonholer Attachment, Vintage Singer theme animal (Click here to learn all BOO FRM20897 157 Model:99K EL1771 indicates an original bundle (Click here to learn all about the significance and scarcity of the Red S Featherweight but would have been ordered as a specialty sewing item from the old