Controllers are the most valuable part it seems. People are always in need of a particular one for their machines. Now that they sell the solid state controllers, I wouldn't go for an old one, except for the plug for that model machine. The plugs are sometimes the hardest to find part of the equation. Needle ad bobbin plates are also something that is needed someitime.. If the motor was good, then it could be parted out. Ebay seems to be the place to find a buyer. The 70s machines virtually have no value. if they won't sew.