1941 stamped lid.
From what I can see the lugs seem to be stamped 1940.
There is no date on the lining.
The netting has melded onto the metal. I suspect that this has happened in storeage. So in other words , a portion of the netting it still affixed to the exterior of the helmet until this day, as the photo shows, you can see a tuft of what is left.
This is a 100% genuine netted helmet, which is self evident.