Rich, 1966 was LONG before enzyme pre-soaks, thus no need for enzyme soak cyc.e IN a lot of ways, this washer was so much like a Whirlpool with their Super Wash, except the 'mores fully drained and did a spin after the pre-wash (SuperWash on Whirly). So the prewash with whites or color fabric cycles was state-of-the-art for 1966. I am also betting the "heavy duty" button was an option, just like the custom care (el-lo agitation) button was an option. Heavy Duty probably "cancelled" the shift to slow agitation at the 4 minute mark in the regular cycle, possibly even the Perm press cycle. After all, remember these spankalator washer were pretty rough on clothes as it turns out.