The detergent dispenser is located under the lid and mounts in the left rear corner. It is removable and is only used when the "Soak & Wash" option is selected (otherwise it will likely get knocked out of place when loading or unloading a batch of laundry). Extra points if the dispenser is still lying around somewhere. My mom had the 1974 version of this machine (identical except had the selector knobs above the console) for 25 years and the "Quiet Pak" transmission truly lived up to its name. It cost $309.99 new.
I wonder if the claim about this being the "finest" washer in the Kenmore line could have been because Sears considered Lady Kenmore a different class of washer entirely. Regardless, this is a rare model and well worth restoring. It might not even need a full restoration, but it's definitely an oddball model and certain parts may be harder to find compared to lesser models. I encourage you to offer it up for someone else if you decide against getting it operational again -- assuming it isn't currently. You never know.