Dave
I would agree with Richard that the black is a primer. I have never observed an additional primer underneath the black.
Regarding the disc with pin holes in between the reflector and glass, this was standard on war-time production British and I believe Canadian pattern side lights. Only the slightest glow was meant to show.
On one model, either lucas or Butller, the exterior rim also wraps futher round the rim to give better shielding.
Regarding head lights, it was common early in the war to horizontaly paint the top half of the reflector to reduce light spill.
|