In 1935, the Raja of Nanpara commissioned the Belgium shop of Henri Jonckheere and his son Joseph Jonckheere to design a one-off body for his Rolls Royce Phantom I. The Jonckheeres were well known throughout Europe for making bodies on both cars and busses.
The car itself is almost 6 metres (18 ft.) long. The doors, which are actually oval, required two half-moon pieces of glass that closed towards each other within a complex winding mechanism. Other details included sliding left and right sun vents, a sloping fastback profile and an enormous rear tail fin. It was also one of the few Phantom Is which featured a modified front grill. (supercars.net)
Archive photos of the 1935 Rolls-Royce Phantom I Jonckheere Aerodynamic Coupe: