Hull's Long Sword

Hull's Long Sword is found in a chest (the only unlocked chest) in the Candlekeep Barracks. It is needed to complete the side quest Hull's Sword.

Hull's Long Sword is identical to a normal Long Sword in every way, except that only it will satisfy Hull and his quest. You could keep it and wield it yourself, if you wanted to, or you could sell it to Winthrop for 5 gp (give or take, depending on your Charisma score) instead of returning it to Hull for a much better reward, if you've got some sort of self-punishing grudge against him.