cazalea[Seiko Moderator]
20967
That's a new design, Mitch
and from what I have read, you won't have seen it before on any other watch.
Basically it takes two stacked wheels - one in front is partially transparent and the one behind is solid. Lots of little gears and things keeping them going in daily (day/night) and 29.5 day (moon) cycles.
Mike