HATTORY-SEIKO 66A Exploded diagram BrandHATTORY-SEIKOCaliber66ASizeFunctionVersionHandsStem351-663Stem (subs.)Stem (2 pce)Balance staff315-611 (28732 Boley)Balance staff (subs.)Mainspring (subs.)401-660Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.721Balnace cplt. -for shock-absorber310-6609840310660