Silver boatswain's call with a barrel-shaped buoy with a foul anchor on both sides.

The keel is decorated with a cable design and terminates in a scroll. The gun curves down. The initials 'WHM' are crudely engraved in a panel on the keel, and there is a ring to attach a lanyard.

The boatswain's call has a long history both as a symbol of office and as a practical instrument for conveying orders at sea. Its distinctive shape has remained practically unchanged from medieval times to the present day. The call's shrill whistle can be varied in pitch to convey a variety of information, and can be heard above the sound of wind and sea. Such instruments were private possessions rather than official equipment and silver calls like this one made suitable gifts and presentation pieces.