Hmmm... very interesting! An early version of the spray-arm plus rotorack, by the look of it. I've got a front-loading Kenmore '600' that seems to be a '65 model, but it still had the impeller for the lower rack and had pink racks. Of course Lady K was a bit higher up in the features/equipment list, so I am stumped. Perhaps a '66 or '67 model??