Lights on prewar British tanks

[Dave Page]

Hi Richard,
yes, I have noticed the inspection stamps on the lamp bodies as well. Would vehicles have left the factory or have had replacements fitted in field and still been finished in black, until the vehicle was repainted later?
The question on the masks still remains. I can see the benefit of having the masks, or doors, finished in black, were they left unpainted during the war? I have looked at lots of images but it is hard to tell as flat paint tends to almost absorb any dust about, making it all blend in together (which is the whole point of camo).
Thanks,
Dave