This is a vintage Singer Sewing Machine Model #221 Featherweight foot controller and power cord. These controllers were set up with the power cord and the controller wire running through the female plug block. If your 221 is set up this way, this controller will work fine. Many other Singer models also used this same setup. This controller will work on any vintage Singer set up this way.
There is all new extra long wiring on this item which will provide for safe operation. The old wiring is usually in very poor condition, dangerous and should not be used. This unit is fully tested, cleaned and working great.
If you want to get your sweet 221 Featherweight, or other Singer back to original and running safely, this setup will be perfect.