HATTORY-SEIKO 8M15 Exploded diagram BrandHATTORY-SEIKOCaliber8M15SizeFunctionVersionHandsStemStem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.4018M15Winding stem03511489840351148.8M15MAIN PLATE(PLASTIC)01000869840100086.8M15TRAIN WHEEL BRIDGE01251869840125186.8M15CENTER WHEEL AND PINION02210429840221042.8M15FOURTH WHEEL AND PINION02411019840241101.8M15Hour wheel02711939840271193