We have this car in our barn . . .

So my husband just informed me that the button I remembered on the old Ford would have been the dimmer switch for the lights, not the washer fluid. So maybe there was an extra pedal down there at my feet I would pump for the water?? No matter - at 15, I was just tickled to finally learn how to drive, but I have to own up to my mistakes here with all you car experts!!
My '69 Dart has both; foot operated dimmer switch & foot operated washer pump. I think a lot of cars had them.