HATTORY-SEIKO 7813A Exploded diagram Brand HATTORY-SEIKO Caliber 7813A Size Function Version Hands Stem NL (354-781) Stem (subs.) Stem (2 pce) Balance staff Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery MovementsArtno.brandcaliberSizehandsfunctionspecialHATTORY-SEIKO7813A Watchparts Part NocaliberdescriptionoriginalArtno.2556Datumstern- / Datumanzeiger- Mitnehmerrad802-78198408027814000Electronic module4001-781984040017814060BCoil -red4002-782984040027828240BDay indicator spring-clip0963-7819840963781