It is currently fitted with a 6-volt bulb, which is correct for the period, but it would just as easily accept a 12-volt one. The wiring came with it and I assume it is the same age as the light. It looks sound, unused and in good condition, but I would advise you to replace it with the appropriate modern wiring if you are going to fit it to a car, because there is the possibility of invisible deterioration to the rubber insulation inside the cloth covering.
I think that's about it - the photos speak for the condition.