This is Ruthie, she was manufactured in Japan and rescued from a premature trip to the dump!
She sews fancy zigzag stitches with built in cams. The cams are selected by using a stitch selector dial and switching the stitch width knob to "F" once the stitch is selected the stitch width is moved back to "O". She has an automatic four-step button holer on the reverse dial.
After I phoned the lady who gave me this machine she dropped off the manual and accessories.
Ruthie uses high shank feet, standard class 15 metal bobins and regular sewing machine needles. There are two buttons control the feed dogs for free motion quilting and embroidery.
For more vintage treasures please head over to Colorado Lady's blog.