@Xerecs: I think the Marto could be 15. Very basic and simple Bombardier.
Historical Custom of the Day #234
Ability: Once per turn as part of a move action, this ship can randomly take one treasure from any ship up to S away from her. Pirate crew may use their abilities on this ship.
Link: John Davis
You can find my custom sets here: Pirates of the Age of Sail and Pirates of the Epic Seas