Brand ZENITH Caliber 231 Size 16 1/2 Function KLS (6) Version Hands 1,15x2,00 Stem 9026 Stem (subs.) Stem (2 pce) Balance staff 35706 INCA Balance staff (subs.) Mainspring (subs.) 1,50x15,0x0,18 Mainspring (subs.) = 4307 Battery