Sorry it took so long.
But hardly time for hobby's at the moment...
But I found it.
It is registered in the Militaria BELGICA 2007-2008 (jaarboek over uniformologie ) publisched by the Koninkijle Vrienden van het legermuseum.
And it is the mod 1955.
However I didn't see any fez, over time, with a tassel like yours...probably a personal fantasy...