"Magic Skeleton" ETA 2824-2

15 seconds later the dial is almost completely black!
Every 15 seconds the dial is almost completely transparent or completely dark or black. And amazing effect. Two polarized disks - one of the holds the "second hand" which is nothing more then a red dot on one of the disks - make for this nice effect. The crown has an interesting shape, but the watch is very hard to wind, the crown button is too slippery.