Duesenberg Model D Concept, 1966, by Ghia. The prototype for what was to be a new generation of Duesenbergs is for sale on Hemmings for $475,000. The concept was designed by Virgil Exner and built by Ghia. It was on display at the Auburn Cord Duesenberg museum for 30 years until it went to the Bortz Auto Collection where it has been for the past 15 years. It has travelled less than 500 miles.