Brand UNITAS Caliber 426 Size 18 1/2x21 Function Version Hands 1,15x2,00 Stem 12003 Stem (subs.) Stem (2 pce) Balance staff 52002 INCA Balance staff (subs.) 53001 SSR Mainspring (subs.) 2,5x16,0x0,20 Mainspring (subs.) Battery