Audemars Piguet Royal Oak 255594ST 36mm Day-Date Moonphase Klein Blue Full Set 2001, excellent case that appears to have been polished in the past and shows very light wear from use, excellent original and rare "klein blue" dial with light patina, the hands are matching, the original steel bracelet shows very light stretch for its age, the watch comes as a full set, no service history, perfect working conditions