The Hispano-Suiza H6 was built from 1919 to 1934. During that period approximately 2,500 units were produced. When introduced in 1919 there were a number of technical features including: 6-cylinder aluminum engine with 7 main bearings, full pressure lubrication, overhead cam, 12-volt electrical system. The car also came with 4-wheel brakes with 16-inch aluminum drums with cast-in steel liners. The car also holds a patent for power-assisted brakes. The interior is unique to each car. (source of data www.conceptcarz.com)