This third boat, Albert Edward ON 463, was based at Clacton-on-Sea and after eleven years service was taken in hand for rebuilding with a motor.

With the conversion of ON 463 deemed a success, plans were put in hand for the production of a series of 45 ft Watson motors, but due to the First World War, the first boat did not appear until 1919.

Like ON 463 the first eleven production boats were open decked and retained full sail plans and a drop keel.

Experience showed that the open deck layout was inadequate for the longer services operated by the motor lifeboats and from the late 1920s a shelter was added ahead of the steering position.

The final ten boats, built from 1923(ON 684), were to a revised design with a cabin capable of taking twenty survivors ahead of the engine room.