sentences:  In addition there was a locking differential, engaged from the dashboard by the driver.Regular production began in 1941 and the first batch of 150 vehicles was delivered between 1941 and 1942; production was then halted due to war events Total production amounted to 150 series cars plus two prototypes.The 6C 2500 Pininfarina was manufactured during the Second World War until 1943, when Alfa Romeo manufacture was switched to the technical needs of the army.