An update on the toy JACKPOT machine, well it is not a toy, far too well made. It measures 6"x6"x12" and weighs 5lb or 2Kg. It is almost certainly a trade stimulator. It works as follows: insert the coin (after much trial and error I found it takes an old half/penny as none of the others would release the balls). Press the black button on the front to release the ball bearings (4 in total), then press down the red lever on the right hand side to put the balls into play, then press down the black button on the right to fire the ball, then try to catch the ball in the cup that moves when you rotate the brown knob on the front ( similar to clown catcher). If you catch three balls, press the black button on the front to receive a token through the tray on the front. The tokens are filled through the slot on the left hand side. As far as date goes, after consulting with colleagues we think 1950s/60s, judging by coinage and general look of it.
If anyone has any more information on this machine, I would love to hear it, as this is one of the most intriguing machines I now have in my collection.