These would have been issued preferentially to Armoured troops, or more specifically troops with motor transport or SP artillery. Mind you it is also known in Belgium as the 'Recce' helmet, which implies it was used by recon troops, scout cars, armoured cars and so on. In service for quite a while, from the ealy 50s until the 1970s, I think. This is a very nice example of a hard to find helmet. Lucky person!
Thanks Greg! I saw similar helmets on the net but not one exactly like this.
Worth remembering that while this is similar to the British AC helmet it is not the same; a copy, yes, but not an identical one. These were definately made in Belgium, as were the copies of the British mk2 (fairly common), the Para helmet (not uncommon, but sometimes has the flag scratched off so as to be passed off as original british) and the copy of the Mk3 (genuinely rare!).
This is a really nice example of an early Belgian made helmet. It's the fist time I've noticed it, but the liner bolt is offset from the center so the helmet sits differently on the head, The British version I believe was in the center. I don't think you will find better.