On Tibia´s update 6.1 on Dec 23 of 2000 year there was included outlaw camp , kazz desert and what we know today as POH.
And close to where now there is the quest of the Bright Sword there was another quest where you could get the Horned Helmet once every map reset. In that years the map reset was only 2 times per year, so per year there was only able to get it twice.
This quest were removed on 2004 so you could only get the helmet between 2000 and 2004.