Every one here is so helpful and I need some info.. I just recieved my new(to me) 221 featherweight. Can't beleive it. Any way what is the difference between 221 and 221-1. On my machine there is no plate on the front that says 221. But the serial # AJ006606 matches the print out I have on Vintage machines. Can someone enlighten me on this ? I am so confused . Karen