Could use comments on what the blackout cover dimensions just short of 6 inches in OD, may have been used for. Would it fit a James ML per chance? Lettering on top seems to be "L-WD-H"
Probably worth noting that both the Butler and Lucas version of this mask were of the earlier variety later superceded by the type with a fold up flap below the hood. This exposed a half-round glass which allowed more light to be shed on the road under non-blackout conditions.
I drove my Tilly to ITV Studios in Southampton about 7-8 years ago for a short news item that was supposed to be filmed about 2pm. It didn't happen till about 5pm. Which put me in the dark and rush hour traffic for my trip home to Poole. One of the most frightening drives of my life on the A31