Lucas PLC5 power switch / headlight power switch with two keys.

Three position switch marked "OFF", "S" and "H". The chrome edge measures 54 mm in diameter.

The body of the switch itself measures 50 mm. It includes a fiber mounting washer and a safety clip.

Twin AJW 500 - 1949-50 Ariel Plaza 4 - 1949 BSA C10 and C11 - 1939-53 Cotton 150cc - 1936-38 Cotton 250cc - 1938-39 Cotton 350cc - 1937-39. Royal Enfield 150cc, 225cc, 250cc, 500cc all - 1938-39. Montgomery single - 1939 New Imperial 150cc, 350cc - 1937-39 OK Supreme 250cc - 1937-38 Panther 250cc - 1949-57 Scott Twin - 1949-50 Triumph (all models) - 1938-39 OEM: 344606, 344325, 34080A, 34075A