The Stutz Coupé was based
on a Pontiac Grand Prix.
The first edition of 1971 had a windscreen in two parts like the Exner-Bugatti.
There was no rear-bumper; the spare-wheel had this function...
In 1972 the Blackhawk was totally modified.
The car got a "normal" windscreen...
...there was a second side-window...
...and a rear-bumper.
At least in 1972, there was also a different design
for the luggage compartment available.
The "hump-trunk" was only produced a few times, perhaps only 5 or 6 times...
In 1973/1974 the second side-window disappeared and the Blackhawk got again a new rear:
Downsizing of the 1978
Grand Prix caused in 1980 another design change.
Already in 1976, Paolo Martin made some design-sketches for the renewed Blackhawk.
The final design was quite different, but you can see some similarities to the rear-design of the Diplomatica and Royale Limousine.
The late Blackhawks were based on a Pontiac Bonneville.
(Have a look at the different rear-designs)
Duplex / IV-Porte / Victoria