Scale: 1:12. Model of the gun turret designed in 1862 for the ironclad turret ship HMS Royal Sovereign (1857). The model is made brass and wood and has been partially painted in blue. There are a set of gears that can each be used to rotate the turret. On the roof of the turret is a ventilator; another part on the roof has either been omitted or is missing. A section of the roof can be removed to reveal the gun below on its mounting. There is provision for a second gun. The model mounted on a baseboard, which resembles the planking of a ship's deck, and it is inscribed "Lowerdeck", "A1", "Auxiliary gear" and "Note: When worked with one set of Gear the other sets should be disconnected". The turret is inscribed "Level of upper deck". There are four partially illegible labels on the deck.