Basic Surgilator....
that black agitator was the standard for many years in bakelite.....around 1970ish the polypropylene ones were introduced, which extended the base fins a bit, known as Super.....Double Duty Super I found to be their best one, full wavy fins up to the very top, and wings at the bottom for Handwashing...
BOL units only got the nubbed cap.....shiny chrome, and then later all white plastic, full caps were used on higher up models....
the MagicMix Dispenser Filter Brush was used for many years...until the option of the Magic Clean filters were introduced for higher end models...loved this type, but a PITA to clean
other versions of "Bed of Nails" type manual filters were used to replace the brush style....
there were even snap-in type manual filters way before the surgilator was created...
there was some great award handed out to the company that created the DIE to cast the Surgilator's wavy fins.....I can't find that article at the moment...