Electro boy, electric clock

Electro boy, electric clock.  The clock is made of brown plastic, not bakelite.  The clock works and keeps accurate time.  There are four hands - a second hand, an minute hand, an hour hand and a fraction /24 hour hand.  There also seems to be some sort of automatic switching system linked to the clock - I don't know how that work and aren't sure how to test that aspect of the clock.  Should you be placing a bid, place it under the cognisance that the timing system is untested and perhaps therefore assume that it doesn't work.  There is also a button on the top of the clock.  I'm unsure of its purpose.  The clock isn't an automatically starting clock and requires the user to turn and release one of the back knobs to start the clock.  Postage will be R40.  Dimensions of the base 175mm, clock height = 125mm and width is 55.  There is tarnish on the bezel.