I think the washer is a 1977 model. It could be a '78, but that would be the latest. That timer wasn't available yet in '76, nor did they separate the Knit and the Delicate yet. Most models until 1980 or so did not have the Pre-Soak cycle. There's a Penta-Swirl under the hood, and it's an 80 series machine.
I had one of those come through my "shop" in Coffee which was a late '77 machine. The '79 and later machines had the 'ENERGY SAVER' notation above the level and temp controls, and they remained there until the 1981 panel redesign, so this one is limited to '77 or '78.
Gordon