There is a whole chapter (#4) about the GE Sew Handy in the book "FEATHERWEIGHT 221 The Perfect Portable" by Nancy Johnson-Srebro. From what I can understand (I'm still new to vintage machines) the Featherweight inherited it's basic design from the Sew Handy but Singer made some improvements ...swinging bed extension, easier accessibility to the underneath if the machine for lubrication, reverse sewing, easier access to the bobbin area, etc. I'm sure Billy will be able to add lots more to this information.