Interesting guy Jim Rosenthal. I always enjoyed his posts and was sad to see him selling his Hatteras.
Back in the late 70's my father owned a Mercedes 6.9 sedan. The car had an all aluminum 417 ci injected motor with dry sump (oil kept in right front fender) and hydropneumatic suspension that could lower the car at speed. That car was a friggin rocketship and I almost killed myself more than once pushing it towards its limits.
I used to like going to the parts counter at the local dealership...the young guy would ask "what model" and I'd say 6.9 sedan and he'd say "no such thing." Finally one of the other counter guys would come over and say "yeah there is, that's a rare bird."