Captain Brass Hand Harry is a pirate captain found on the island of Mos Le'Harmless on the 1st floor[UK]2nd floor[US] of the pub Harpoon Joe's House of 'Rum'.
He is one of the five captains required to obtain the five marks. In order to obtain this captain's mark, you must repair one of his brass hands. This requires having a hammer and two bronze wires in your inventory.
He is known to be quite strict and efficient, with a sense of hierarchy over the other Captains. He is regarded as one of the most feared and influential pirates on Mos Le'Harmless.