IWC 403BrandIWCCaliber403SizeFunctionVersionHandsStem5317Stem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.180/1BBarrel complete -with mainspring94200180403210BThird wheel94200210403275BSweep second pinion94200275403401Winding stem8025317407BClutch wheel94200407403410BWinding pignon94200410403430BClick spring94200430403443BSetting lever assembled94200443403471854Friction spring f. sweep sec.-pinion94200471403710BPallet fork -pinion 1 lower end-piec.94200710403770BMainspring94200770403