These come in two styles, one you need an external foot pedal, and the other has the "foot pedal" built in.
I've got one of each, though the external pedal one I'm not going to keep.
DH has no desire to fix up another one LOL!!
I wanted one because I needed it for my collection, but it would never be my "go to" machine. More of an oddity than anything. There is a reason Singer didn't make them for very long- and came out with the much improved 201.
This is the underside of the one with the speed control (foot pedal) built in. It had a special knee bar to control it. Also notice the old style "plug in" connection.
I love the little pull chain on the light!