This wonderful gadget is a gyro compass.
A gyro compass is a type of non-magnetic compass which is based on a fast-spinning disc and the rotation of the Earth to find geographical direction automatically.
Made of brass, it has been removed from it's casing. The brass ring that would have held it in place and allowed it to move with the ship can be removed.
A fabulous nautical piece.
Measures approx: 37cm diameter x 17cm