The Duplex was a sedan version of the Blackhawk, and was sometimes called by that name as well.
The final Stutz sedan was 1981's Victoria. It was longer, and was positioned as a limousine, complete with Stutz-provided driver service.
Many of these Victorias, all of them white, were sold to the Royal family of Saudi Arabia. But within 2 to 3 years all of them were retired due to various malfunctions created by the excessively harsh climate and environmental conditions. Also the cost of maintaining the car was too much even for the royals.