I have an original black out mask for sale..undamaged and complete, no rust. If you like 'patina' in can go straight on..if not it will require a respray.
It currently has 'SIGS'(signals)(the remains off) stencilled on the 'peak'.. this is not original but copied from a wartime photo.
Size is suitable for a DU42 headlamp.
Price is £65 plus postage...Ian