L451 Bulkhead Mounted Sidelight with plastic lens. Also available as dual pole for the inclusion of a discreet indicator.

As fitted to;
Land Rover Series 1 80 1948-51
Austin A70 1948-49; 25 cwl. Van and Ambulance 1948-54
Bentley Mk VI & R Type 1946-52
Lagonda 21 litre 1949-52
Morris Commercial FV & FVO 1949-53 FVS & FVSO 1954 Petrol Tanker 1951-52; PP Coach 1950-52
Rolls Royce Silver Wraith & Dawn 1946-58

and more.
Alternative reference numbers include;
217588, 261496, 217588, 261498, 261497, L451, 571468, 572268, 571465, 52047A