A 1930s Duesenberg dual cowl phaeton. Phaeton meant it was a rag-top, windowless touring car. Dual cowl meant it had 2 windshields, the second for the rear seat passengers.
The SJ was a supercharged straight 8, dual overhead cam engine, when most cars in the US were side-valve flatheads, producing about a fifth of the horsepower of this thing. Actually a US car, despite the German name, it was the fastest road car ever made in the US until the Corvette in the 1950s.
It held 1920s land speed records and won the Indianapolis 500 race a couple of times. It's still considered by many car historians as the finest automobile ever produced in the United States, and certainly the most expensive for its time. And subject to the body style (the Duesenberg brothers sold you the chassis, you selected the coach work & builder yourself, though there was a prescribed company appearance), I think some of them qualify as one of the best looking cars ever made.
Oh, and BTW, the old US phrase, "It's a Deusie", almost forgotten today, and meaning something that's over-the-top, comes from this car. Because in its day nothing could match it.