Sorry for the bad pictures (taken a long time ago & no longer have the helmet)
An American M1917 I take it? but with a British liner & nut & bolt.Plus also the adjusta pad chin strap, these were used on the civilian protective helmet, which like this American helmet had chin strap lugs not user friendly with the Mk2 chin strap.
What I can remember about it it all look original to it.
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