Here's my slightly knocked about 'Atlas' Harbour Tug toy from Ideal's 'Boaterific' range.
For a toy it's got plenty of little bits of detail, unfortunately most of it is quite delicate.
There's a few broken or missing pieces on mine, but it still looks the part.
There were six boats in the set when they originally came out in 1967, and used Ideal's 'Motorific' electric motors, which were first used in 1964 for Ideal's Motorific slot car sets.
The motor is slotted into the hull with the batteries. Ideal's exclusive automatic bailer pumps any water out of this lower compartment.
To accommodate the workings the hull has to be quite deep, but once in water that wouldn't be a problem.
The rudder acts as the on/off switch. Note the auto bailer tube.
The case display card,
I've got to hand it to Ideal, they did come up with some fun toys in the sixties.