HATTORY-SEIKO 2415A Exploded diagram BrandHATTORY-SEIKOCaliber2415ASizeFunctionVersionHandsStemStem (subs.)Stem (2 pce)Balance staff315-240Balance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.721Balnace cplt. -for shock-absorber310-2409840310240