A screenshot of an Uncertified 'Formidable' Second Rate Deed.
Certain ships can only be built with the express permission of the Crown. In order to command this ship, take this uncertified deed, along with the correct Writ, to your national Capital to have your deed certified.
It requires 75 Royal Commendations to get the Writ for the 'Formidable' Second Rate. Or get in from Treasure Aisle (TA) for 950 Burning Sea Points (BSP).