The new Audemars Piguet Royal Oak Equation of Time is the very first AP RO in all the 38 years of the model’s history to be presented with a perpetual calendar and equation of times, the astronomical complications usually reserved for “dressier” APs. Movement: AP 2120/2808, automatic, 423 parts, 41 jewels, 19,800 vph, 5.35 mm high, 28.4 mm in diameter Complications: Perpetual calendar, date, leap year, month, day-of-month, moonphase, sunrise/sunset indicators at 3 and 9 o’clock Power reserve: 40 hours Case material: 18-carat Rose gold (26603OR.OO.D092CR.01) or Stainless steel (26603ST.OO.D002CR.01) Bezel material: Rose gold or Stainless steel Case shape: Round, Octagonal bezel Transparent case back: Yes, sapphire crystal caseback Case size: 42.0 mm Case height: 10.45 mm Dial: Silvered Numerals: Arabic Hands: Gold Strap: Hand-stitched, crocodile strap with square scales, 18-carat pink gold or stainless steel AP folding clasp Crystal: Sapphire, anti-reflection coated Water resistance: N/A