Any help with these would be much appreciated. They came with other Japanese civilian helmets but are of an uncommon style - I quite like them. They are shaped like a WWII era Commonwealth helmet but are made of a hardened plastic or fibreglass material. A very basic liner and chinstrap. These helmets would only offer the slightest protection
I can only suspect that the writing tags may offer a clue - The first column (2nd for the West) of writing appears to say the same thing on both helmets.