UNITAS 187-1 Brand UNITAS Caliber 187-1 Size 10 1/2 Function SC Version Hands 0,70x1,30 Stem 6912 Stem (subs.) Stem (2 pce) Balance staff 31216 INCA Balance staff (subs.) Mainspring (subs.) 1,55x8,5x0,09 Mainspring (subs.) Battery WatchpartsPart NocaliberdescriptionoriginalArtno.401Winding stem8026912721BBalance cplt. -regulated92000721187723Balance staff ST -shock-absorber80231216