Battleship. Powered by 2 HP11 / C batteries. Unusual in that you started the motor by flicking the propeller. The motor is stopped with your fingers too. The engine sound is provided by a metal strip being flicked by a plastic protrusion on the propeller shaft. The hull has drain holes at the rear enabling any water ingress to be drained out after each voyage. My grandmother bought me one of these in the 1970s.