Civil Defense Helmet

[Mr. Green]

Hello, I scored this helmet at a local auction, I found out that it's apparently a Civil Defense helmet, specifically for an Air Warden. But there's a catch, I haven't seen one like it. Not one. On the entire internet. I know I'm supposed to find out myself, but I haven't found anything, does anyone know what exactly it is? Looking forward to a response, thank you!

[Mr. Green]

Also, there is a faded badge on it, not sure if I should even bother taking an image..

[Mr. Green]

Stamp, I mean. Not a badge.

[Mr.Jerry]

This looks to be a standard WWII era Civil Defense helmet and the painted insignia is indeed for an Air Raid Warden.  Sometimes they used decals. Sometimes they were blank. Sometimes they were painted by individuals or towns ( I have seen many Aux Police ones around here) It would be nice to know what city/post used this one.