This replica Lucas 477/1 light unit was a later version and I believe was fitted to Norton road bikes in late 1930's - 1940's, taking over from the MT110 which we also sell (Item0403). It is dual filament with stop light facility, which on modern roads I think is essential.
Although made by a proprietary supplier (and probably made in China), I have to say I was really impressed by the quality of this unit, it looks very nice.