Patek Philippe Calendario has the slate grey dial is adorned with the Patek Philippe moon phase indicator and elegantly displays the day, date and month on the watch face set among windows. With water resistance up to 30 meters, this automatically moving tonneau-shaped model is sleek and sophisticated, using the sapphire crystal case back of the Patek Phillipe design. The pre-owned Patek Philippe Calendario watch models with the reference number 5135 are supplied with one year warranty.