The KA agitators were blue, this is likely a replacement or a very early KA model. The first of the KA and WP Direct Drive washers did not have the auger agitator as that was a Kenmore exclusive until 1987'ish. I don't know for certain, but I don't think KA ever offered the all-pushbutton washer with a three speed motor. Mine didn't have it, nor did the first of the electronic control KAs. I have a friend that has an '87 KA washer, MOL model that has the straight vane blue agitator. She and her husband are "empty nesters" now, but her KA washer is still as strong as ever after raising two kids with that washer.
The larger blue agitator - only in 3 speed washers - used medium speed for normal agitation, and extra-low for gentle agitation and gentle spin. High speed was only used for drain and high-speed spin.
The 3 speed machines were very nice, that larger agitator and slower normal speed made the direct drive design more gentle than the WP and KM cousins. KA machines were more suited and marketed to the upscale, white-collar buyer that had more dry cleaning than play clothes. In the pushbutton washer, the heavy soil selection only offered a maximum 8 minutes of high agitation. WP did some strange things with the KA timers & speeds over the course of the brand's laundry line, Roger has a KA washer that only spins on low after wash in the normal cycle. KA also had a short run of faulty timers that caused their subsequent reliability ratings to plummet in CR reports. Though they corrected the problem quickly, the fewer numbers of KA machines sold left this stain on their rating for a few years.
In early 2008, WP dropped the KitchenAid laundry line with their acquisition of Maytag in an effort to thwart any question of monopoly in the laundry marketplace.