This iron rivet was taken by a Harland & Wolff shipbuilder who worked on the ships Titanic, Olympic, and Britannic. He was employed as a "heater boy" with the responsibility of heating the rivets just before being hammered into position. Coming from a devout Christian Protestant family, they were going to use these heavy rivets to throw at Catholics during the violent religious struggles of the time. Thankfully they lost their nerve for fear of losing their jobs or encountering retaliation. Although this rivet was retrieved from Titanic's dock, there is no way to positively attribute it to that ship. When Titanic sank this rivet (and others) was simply kept as a souvenir reminder.