Clarifications..........
The gentleman is question is a member of Lambda Car Club International, (LCCI), and he was at the Grand Invitational in Ft. Lauderdale two weeks ago. He is from Atlanta, works for Porsche and always has a prototype auto--see photo. I know this as he has been a guest in our home several or more times.
The convertible was correctly identified earlier as a 1976 Pontiac Grand Ville. The Grand Villes were wonderful cars and came in hardtop versions as well. They were high end and heavily optioned.
However, the correct lineup in the earlier pic is this: 1976 Pontiac Grand Ville, 1970 Buick Skylark convertible, 1972 Oldsmobile 98 Luxury Sedan, 1979 Cadillac Phaeton Coupe' and a 1973 Cadillac Fleetwood 75.