Let's start with which side of the helmet it's on. It could just be the backing for a decal. Hard to say with one pic. Take future pics outside in natural light. Will show details much better
Could be anything, I've not much to add to Todd's advice.
If you were it. Left side..
With so little of it surviving it probably does not really matter. Does the lot number survive, as researching that might answer your question if you need to know?
Whatever its just an opinion.
Left side it will probably be a Heer, maybe police. Anything on the other side?
If nothing on the other side I would say you have 2 Heer helmets Even more likely if they were found within the same general area.
it is at an place in belgium where the SS, heer and FJ fought haha.. You can find anything there.
great helmet.like to see and the decals