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.