Let's see. I have two favorites and you hit on one of them, sort of. You are correct about the Royal Navy and the pint of rum. That rum is still made in BVI - Pussers. Definitely excellent and no doubt belongs on a sailing vessel.
Additionally, there is the oldest known rum still being made: Mount Gay. That claim is based on a deed dated 1700 something.
Now, go the fight club thread and read the recipe for a dark and stormy. Good luck finding it as there are 2000 something posts there. The recipe was from a time long, long ago...........