Audemars Piguet Perpetual Calendar "150th Anniversary"

Audemars Piguet's Royal Oak Perpetual Calendar "150th Anniversary", reference 26585XT.OO.1220XT.01, has a titanium case measuring 41 mm across and 9.9 mm thick. The case is fitted with a sapphire crystal, through which the openworked dial is fully visible. Inside is the self-winding Calibre 5135, a historic movement finished in skeletonized form. It drives a perpetual calendar with month, weekday, date and leap year indications, along with an astronomical moon phase display. This is a limited edition, one of 150 pieces made to mark the anniversary. The integrated bracelet pairs titanium links with BMG studs and closes with an AP folding clasp. Water resistance is modest at 20 metres, in keeping with the dress-oriented nature of the piece.