HATTORY-SEIKO 2B31 Exploded diagram BrandHATTORY-SEIKOCaliber2B31SizeFunctionVersionHandsStem351-134Stem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryMovementsArtno.brandcaliberSizehandsfunctionspecial161660HATTORY-PULSARV233 A5 1/20.65x1.10SC WatchpartsPart NocaliberdescriptionoriginalArtno.4000Electronic module4000-49998404000499