Look At This

[Nickc]

https://www.ebay.co.uk/itm/254989904617?hash=item3b5e952ae9:g:Vg4AAOSwoBdgqRaw

Not sure what it is, the shape is weird when compared to what I have seen on here

 

[b.loree]

Kinder helme?

 

[J.LeBrasseur]

Kinder helme?

Possibly but I do not know for sure. The liner looks like a post WWII liner of some kind.

James