REGO 2125 Brand REGO Caliber 2125 Size Function Version Hands Stem 10017 Stem (subs.) Stem (2 pce) Balance staff 40009 Balance staff (subs.) Mainspring (subs.) Mainspring (subs.) Battery WatchpartsPart NocaliberdescriptionoriginalArtno.401Winding stem80210017723Balance staff ST -shock-absorber80240009