Audemars Piguet Royal Oak Day-Date Moonphase ref 25594ST Mk1 DialThis beauty combines the legendary design of the original Royal Oak with classic 36 mm case sizebut with a twist: it is also a bona fide complicated watch from one of the great Grandes Maisons of horology , introduced in 1984. The reference 25594ST features day and date displays in large sub registers at the 3 and 9 oclock positions, along with a moonphase indicator at 6 oclock. And then theres the charm: the layout of the sub dials and moonphase