It is a French Colonial M.26 adrian helmet used during and after WWII.
However I can tell you right away that this is a put together piece; bother badge and helmet liner.
Wait for a better example.
The chinstrap and the liner are from DP (CD) helmet. Not combat!
This is not a colonial m-26 helmet, it's a Marine one. The colonial emblem was a flaming grenade with an anchor on top of it. This is a common mistake because Marines often fought in colonial actions. Here is a nice photo of such an instance, and a pic of the correct type liner, although slightly different 31 liners were sometimes fitted retrograde.
'I do not think we can hope for any better thing now.
We shall stick it out to the end, but we are getting weaker of course, and the end cannot be far.
It seems a pity, but I do not think I can write more. R. SCOTT.
Last Entry - For God's sake look after our people.'
In memory of Capt. Robert Falcon Scott, Edward Wilson, Henry Bowers, Lawrence Oates and Edgar Evans. South Pole Expedition, 30th March 1912.
I am gonna have to disagree with you on this one Ned.
Or the French must have been completely wrong on their own lids:
LE MODLE* 1926
This is a DP (luftshuss) modele 26 as shown by the liner and shinstrap. (as already saisd by Piotreck)
The initial DP badge was taken off, even if we still see some marks of it, and replaced by the anchor