I would not claim to tell for certain from your photos that this is a Belgian helmet, but from what I can make out it probably is. As far as I know all of the Belgian helmets had the tricolour flash on one side - take a look and see if anything has been removed - the paint looks like Belgian original to me. Not all of them had the makers marks inside - I have three and two do one does not - so that's not a certain tell.
These helmets were very close copies of the UK model but were made entirely in Belgium in the early Fifties. WWH cites 1951 only, which may well be correct -
World War Helmets - Casque HSAT, Mark II. As far as I know (we're waiting for Walter Jacobs' book here...) none of the Belgian postwar copies of UK helmets (Mk2, Mk3, DR, HSRAC) used any UK-sourced parts, everything made locally.
These Belgian halmets are much less easily found than the UK original, made in comparatively tiny quantities, and many have been converted by dealers or re-enactors to appear to be original UK helmets. The Belgian Mk3 has particularly suffered from this, being altered to be 'D-Day' helmets which apparently have greater value.
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