A genuine Lucas dashboard instrument illumination dimmer switch, used to control the brightness of the dashboard and instrument lighting on many classic British vehicles.
The switch features the original Lucas illumination symbol on the knob, indicating its function as a panel light rheostat.
Lucas electrical components were fitted to a wide range of classic vehicles during the 1960s and 1970s including Jaguar, MG, Triumph, Rover, Austin and Land Rover models.
This type of switch allowed drivers to adjust the brightness of dashboard lighting for night driving.
The unit has a metal body with chrome dashboard bezel and original bakelite knob.