Audemars Piguet Royal Oak Perpetual Calendar/ Black Ceramic/ Black Dial/ Black Sub_Dials/ Black Ceramic Bezel (Ref#26579CE.OO.1225CE.01)

Royal Oak Perpetual Calendar 41mm Black Ceramic

41 mm case size, Black ceramic case, glare-proofed sapphire crystal, and case back. Case thickness 9.5mm, Slate grey dial with “Grande Tapisserie” pattern, black counters, white gold applied hour-markers and Royal Oak hands with luminescent coating, black inner bezel, Case thickness; 9.5 mm, Dial; Slate grey dial with “Grande Tapisserie” pattern, black counters, white gold applied hour-markers and Royal Oak hands with luminescent coating, black inner bezel. Black ceramic bracelet with titanium AP folding clasp. Water-resistance 20 m, Total diameter 29 mm (12¾ Lignes), Frequency of wheel balance 2.75 Hz (19,800 vph) Number of jewels; 38, Manufacture Calibre 5134, Mobile stud-holder. Power reserve; 40 hours, Balance-spring type; Balance with variable inertia blocks, Number of parts; 374, Function; Perpetual calendar with week indication, day, date, astronomical moon, month, leap year, hours, and minutes. The oscillating weight is guided by a peripheral ring rolling on four ruby runners, which reduces friction and wear to the minimum possible. Moon phase indicator, laser micro-structured, laid on aventurine. Moon phase astronomical indicator requiring correction every 122 years and 108.