That may prove an interesting question. There is alot of arguments about if "H Mahillon" made anything or was just a retail company like sears. (This is gunmaking from Belgium at its hay day). Breaking open the action and looking at the stamps may prove helpful.
None the less the shotguns/hunting rifles tended to be on the high end
Real nice little website. Great pictures. its taken from a set of books "Liège gunmakers".
These books are worth every penny if you like these firearms.