HATTORY-SEIKO 1520B Exploded diagram Brand HATTORY-SEIKO Caliber 1520B Size Function Version Hands Stem 351-152 Stem (subs.) Stem (2 pce) Balance staff 315-120 Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery Watchparts Part NocaliberdescriptionoriginalArtno.210BThird wheel and pinion231-1209840231120401BWinding stem9840351152.1520Stop click AUT03811209840381120