Was looking at shopgoodwill and saw this:
http://www.shopgoodwill.com/viewItem...temID=13656542 with this description: This vintage 1950’s Singer Sewing Machine Model 678 3B has a Singer Sewing Motor Cat. 3-120 and uses 110-120Volts 0.4 Amp. 25-75 cycles A.C. & D.C. The Singer Sewing Motor Controller uses 95-145 Volts 0.7 Amperes and is part # 194584. This is what I have. There is also one on Ebay that also mentions this motor. Is there something different I'm missing or do all 221's have this motor?