Offered are some parts from one of the early Wirt "Dim A Lite" Dimmer Switches.  This one is likely 1910's vintage. It has a porcelain knob and a threaded shaft with some hardware attached. I could find no "Dim A Lite" with these parts on line.  They didn't make many. Pick up the parts for your own collection or for replacement use if you have one of these switches. Mouse over the photo images to zoom in. NO RESERVE!! Thanks for looking.