On the first 80% of the 235s built, the boat came with a marine toilet mounted in a dedicated cabin that doubled as a chart table. With clever sliding panels and a door that gave the area complete privacy, as big as the heads in 30 footers, and was a valued part of the 235 design, in particular with people that used them for weekending. Without a doubt, the marine head with a holding tank is a much more civilized way to deal with the business.
As shipped, the boat came with a rear facing jabsco head with seawater intake and a Y value that split between dumping to the sea or to the 10 gallon holding tank in the aft locker. The whole setup was well done. The toilet sat on a raised platform in the front part of the compartment, and the hoses ran aft behind a wooden panel. Nice.
In say 1991 Beni USA offered the boat without the marine head, at a savings of over 700 bucks. Some people bit. Like your boats original owner. We had the marine toilet on our 235 and loved it.