Brand CERTINA Caliber 23-20 Size 10 1/2 Function Version Hands 0,80x1,50 Stem 7537 Stem (subs.) Stem (2 pce) Balance staff 28515 INCA Balance staff (subs.) Mainspring (subs.) 1,5x9,5x0,10 Mainspring (subs.) = 04133 Battery