On of Sear's varients
Id say this is one of Sear's countless variants. They would always change things up a bit for sales and such. Its possible the timer may not be any different. For example, on the model that had a separate prewash and no second rinse, if one was to jump two terminals in the timer the second rinse could be activated. Similar to Galaxy models that only had a Heavy Duty cycle but by jumping the contacts the next model up also had a press care cycle but same timer. Its possible the same thing was done with the Pre-wash. FWIW, I much prefer this setup. I never liked having a prewash that did not advance automatically.
But hey, great machine none the less. Every single one of these late 80s to mid 90s DDs were absolute marketing genius. The "All American Washer" as I call it. You received your money's worth and then some- best value machine ever made IMO. Great cleaners, gentle action (slow/fast), DD agitators giving good roll over and capacity, fabric softener, porcelain enamel tub, and long life. Seen these last 30 years in the wild. In fact Maytag in the 90s even tested one of these against there own. A mom and pop shop (forget where) ran one of these 24/7 in conjunction with a Maytag dependable care. The news letter said the DD only had two reapirs after some time, but was still going in the end. I think that says something.