You might want to join nsmco. It's a yahoo group. The owner of that group specializes in the National Sewing Machines. You can also google and get info on that machine. I have one made by National but badged for Montgomery Wards from the 1930's. As far as their worth, not much. Maybe 50-100 bucks. Depends on what kind of shape it's in. I paid $10.00 for mine. Most people just collect them because they do sew very well.