I would guess that these NOS headlamps with the black rim are late or post war when black out restrictions were relaxed, and the black mask was just replaced with a black rim. Ron
What happened to stocked headlamps at the end of the war? I'd have thought there was a good chance that the masks were removed on the first occasion that the lamps were checked and re-packaged.
Years ago you used to find boxed NOS DU42 headlamps with blackout masks, but they got snapped up and used first, these with a glass lens and the MU42 types are the last dregs here in Britain, but maybe there are still unfound stocks overseas somewhere?
Yes, that was what I meant...Most NOS WD spares that I've seen in dated boxes have been subject to 1950s re-packing, even the KG3 stuff...Presumably at some point in the 1950s they'd have stopped storing them all with masks and converted to full glass ?
Which I understand was taken early on when the G3L was first built (pre-production version) at Lincoln's Inn Fields, London. It has the Blackout shroud and the black rim.