Belgium M51 helmet liner.
First I had no idea who had used these helmets.
It looks a lot like the ones used by the Belgium Military Police, see Belgium M51 helmet liner Military Police
thanks to my colleague collector "CasquesCollection" I now know more see his blog:
This liner was used by "Regimental Police" personnel at Belgian Air Force bases.
Now I understand why the I can see grey at places where the white paint came of.
This liner is made by SW = Schuberth Werke
69 = 1969
Company still exists: https://www.schuberth.com/en/company/about-us.html
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