My Land Rover has an identical shape switch although black. It switches off the "P" for panel lights when not required, after turning on lights. This was quite common in early cars with dynamo charging as every milliamp counted
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone
