It was a pretty massive unit, which featured several playing stations located around a huge glass case, in which a rotating dice cage (resembling an egg timer in shape) would tumble two enormous felt-covered dice, on a playing cycle of around 15 seconds. Players would bet on the outcome of the dice throw, e.g. double one, double two, etc. (I am not sure of the exact betting possibilities), to win anything from 2d to 12d.
I was always amazed at how the machine knew exactly which sides of the dice had been thrown, as there was no electrical connection between the dice and the floor of the rotating cage. There were of course six sides to decode for each die.
It could not have used magnets and reed switches, as there were too many possibilities to decode. I doubt that the system used infra-red, or radio transmission/reception, as this was the era of electro-mechanical machines full of relays and motors.
So, who can remember the machine, who made it, and above all HOW ON EARTH DID IT WORK?