The Ancient Bracelet is an unlockable salvage item in Endless Ocean. The Bracelet is only available after observing and analysing all six Stone Monuments found in Marige Atoll. After being found, the bracelet seems to summon the Beluga, a befriendable dolphin, who from then on out lives in the Prince's Room.
The foot locker's descriptive text states, "A bracelet adorned with ancient script and a serpent crest. It probably had a formal usage."
The bracelet, after being unlocked, is found in the Gallery of Souls at coordinates F-4 and a depth of 25 meters, or 82 feet.