HATTORY-SEIKO 15A Exploded diagram BrandHATTORY-SEIKOCaliber15ASizeFunctionVersionHandsStem351-152Stem (subs.)Stem (2 pce)Balance staff315-120Balance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.721Balnace cplt. -for shock-absorber310-1509840310150