HATTORY-SEIKO 2B21 Exploded diagram BrandHATTORY-SEIKOCaliber2B21Size6 3/4x8FunctionVersionHandsStem354-235Stem (subs.)Stem (2 pce)Balance staffBalance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryMovementsArtno.brandcaliberSizehandsfunctionspecial161643HATTORY-SEIKOV238 A5 1/20.65x1.10x0.18SC