This is the original vintage buttonholer attachment that came with the machine. The buttonhole templates fit inside the buttonholer and guide the needle around the fabric to make different sizes and shapes of buttonholes. I have used this attachment with great success!
I have never used this vintage decorative and embroidery stitch attachment which makes a variety of unique stitch patterns, as you can see if you look closely at the manual. You put the plastic discs into top of the machine. They tell the needle where to stitch. No computers here!