Actually, these may be 1966 models. Another set of neighbors, who lived next door to us, got this exact set when they moved to the neighborhood. The agitator on their washer was a black Roto Swirl with the scrubber. It lasted until 1979, and the dryer lasted until 1987. I never got to watch the washer run, but I heard the dryer constantly, as the exhaust vent faced our house.
Have a good one,
James