HATTORY-SEIKO 1520B Exploded diagram BrandHATTORY-SEIKOCaliber1520BSizeFunctionVersionHandsStem351-152Stem (subs.)Stem (2 pce)Balance staff315-120Balance staff (subs.)Mainspring (subs.)Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.210BThird wheel and pinion231-1209840231120401BWinding stem9840351152.1520Stop click AUT03811209840381120