As to what the foot is... It is a pleating or ruffling foot....My Mom bought a electric Singer in 1959 and this foot & many attachments and instruction book came with the machine. I made a queen size duvet cover and used this to make the pleated ruffle all the way round the cover. If you can get this to work on any machine it does a wonderful job as each pleat is the same size. I have an Omega sewing machine that I bought in 1978 and it will work on this machine with a bit of adjustment and the automatic buttonholer that came with the Singer will work on the Omega also.