This is an <b><u><FONT SIZE=3>original users / instruction and asjusting</b></u></font> manual for a Singer model 410w1 and 410w100, a single thread chain stitch sewing machine. It is described as a high speed sewing machine. The model w1 is a short arm version of the machine and the model w100 is a long arm version of the machine. It is missing the outside green front cover but nothing very important is on it.