IWC 8531BrandIWCCaliber8531Size13FunctionSC-CLD-AUTVersionHands0,80x1,40Stem6406Stem (subs.)Stem (2 pce)Balance staff29808Balance staff (subs.)Mainspring (subs.)1.25x10.0x0.10 AUTMainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.205= 852Center wheel drilled + cannonH= 29694200205852401Winding stem8026406407= 852clutch wheel852 1994200407852434= 854Clicking spring8542494200434854443= 852Setting lever assembled8523594200443852723Balance staff ST -shock-absorber80229808770= 853Mainspring942007708531143BOscillating weight9420114385311491= 852Oscillating weight bolt1496= 852Oscillating weight axle85201394201496852