Well, it's not a time piece, or a pirate prosthesis, or a pre-historic implant.
A well traveled pirate might recognize what it is. It may or may not be mahogany, but definitely some sort of hardwood. It has been given a good coat of linseed oil and then stained. People make their living using these things. And rich tourists will buy them as objects d'art.
The rectangular part held by "Mr. Rolex"
allows it to be set in place by the user, who will remove it when he's done for the day. The next user will drop his own in place. Remember, each user has his own custom made to the measurement of his __________.