That is a KD-14, and thanks to Martin, it is mine
THANK YOU AGAIN MARTIN!
The KD-14 was the last model to have the cast-iron spray arm. There were 3 models, the custom (which is what is pictured above), the imperial (which I have in shaded coffee brown), and the very first Superba Vari-Cycle. The imperial and superba models have a two-position upper rack. Those models also have a "control panel" as opposed to the solid slab door that is on this custom.
Martin, you are correct. The little stainless steel strainer is the detergent cup. That machine should be a water purge, then a 7 minute wash, followed by two rinses (each about a minute and a half). Each portion (purge, wash, rinse, and rinse) takes 2 1/3 gallons, approximately.