You beat me to it, Ed!
I was about to post that it is most assuredly an 18 series model. The give away is the dual opening rinse dispenser!
The 19 was the first with the single opening, bi metal activated dispenser for the rinse aid.
You can never really tell if and when those are really working, but you can't miss with the solenoid activated ones. You can usually hear the solenoid activating and dispensing.
So this would be a KDS-58 since it is a portable?
Definitely a machine any of us would love to have!