I believe this is a WWII British Brodie helmet. The liner and chin strap are different than usual. Both show wear and age. The helmet has small German decals on it. The black in the decals glows green under a black light much like or the same compared to the black on WWII German decals. There appears to be a slight glow on the red and white decals as well but it is hard to tell. The helmet has surface rust specs and some show through the decals in small spots. A couple of people suggested these look like decals used with something to do with the Luftwaffe or a civilian group that has to do with air raids. The helmet is solid overall and has no dents or dings from what I can tell.
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