Brand HELVETIA Caliber 900 Size 8 3/4 Function INCA Version Hands 0,75x1,20 Stem 6414 Stem (subs.) Stem (2 pce) Balance staff 28907 INCA Balance staff (subs.) 29407 SSR Mainspring (subs.) 1,45x7,5x0,08 Mainspring (subs.) Battery