The Nolte/Christmann Porsche 914-6 GT. Recently sold (2015?), see here https://www.classicdriver.com/en/car/porsche/914/1971/167549

You can also see an excellent replica of this 914-6 GT by going here https://pbase.com/9146gt/other_porsche_9146gt_race_cars_sn9140430000_baumann Dr. Dirk Baumann, the owner of the replica has done an outstanding job!