The item is not available on the STEAM marketplace.
Assassin’s Creed® IV Black Flag™ - Death Vessel Pack
Assassin's Creed Black Flag - Death Vessel Pack
Give a fearsome look to your ship with those 3 unique customization items: The Death Vessel Figurehead, Death Vessel Sails and Death Vessel Wheel. Important: You need to progress until Sequence 3 memory 04 to see those items in the Jackdaw upgrades menu.