A feat of technical mastery, the Royal Oak Perpetual Calendar Openworked dresses the artistic openworked sapphire dial and the movementa??s visible pink gold components in black ceramics.CaseBlack ceramic case, glareproofed sapphire crystal and black ceramic caseback, screw-locked crown.Size41??mmThickness9.9??mmWater Resistance20??mDialSapphire dial, smoked external zone of the counters, pink gold applied hour-markers and Royal Oak hands with luminescent coating, black inner bezel.??BraceletBlack ceramic bracelet with titanium AP folding clasp.CaseMaterialBlack ceramicWater Resistance20 mSize41 mmDialSapphire dial, smoked external zone of the counters, pink gold applied hour-markers and Royal Oak hands with luminescent coating, black inner bezel.BraceletBlack ceramic bracelet with titanium AP folding clasp.Calibre 5135FunctionsPerpetual calendar with week indication, day, date, astronomical moon, month, leap year, hours and minutes.Number of jewels38MechanismSelfwindingPower reserve40 hTotal diameter29 mmNumber of parts374Frequency2.75 hz 19800 vphThickness4.5 mm??