One of the many items that my late father purchased from the local government surplus store, in the late 1940's or 1950's was this British military vehicle headlamp, L-WD-H1-R. As I understand it this type of headlamp was in use during WW2 on British military vehicles but with a mask to deflect the light downwards. The reason for purchasing this lamp was to use it as an auxiliary driving lamp and a fog lamp on a number of vehicles and possibly also motorcycles.