A Featherweight is a Singer 221 sewing machine. There are several types: black, tan, sort of green, and free-arm. It is lightweight and has an excellent feed dog system. It is a favorite among quilters. It is straight stitch only but there are attachments made to allow for other stitches. They were made for several decades. The only fault they have is that the light is located where it will burn you if you pick up or move the machine by putting your hand through it when the light is on. It is not intended for sewing leather, etc, but is excellent for piecing quilts. While I've been told that you can straight-line quilt on them with a walking foot, I don't. Other machines work better. I've found that free motion quilting on a Featherweight is an exercise in frustration. It's a good machine to take to classes. They are highly prized among quilters, so if you are lucky enough to find one, take good care of it.