This is a 'double lead' cord for the Singer 'Rocketeer' sewing machines (the 500 and 503), as well as the earlier Touch & Sew models (the 600, 603, 604). It is a 'double lead' cord, which means that on section of cord has the wall plug, while the other end is wired into a foot control.
If you have any question as to whether this is the right cord for your machine, please ask before ordering.
If your machine is also missing the foot control, I also sell an inexpensive, new replacement pedal. I will be happy to combine these items, wire the new control to the cord and test it before shipping to you -- please inquire if you are interested in this.
Your cord will be sent via USPS First Class Mail with Delivery Confirmation.