Brand FHF Caliber 4 (18 1.2) Size 18 1/2 Function Version Hands 0,95x1,90 Stem 9805 Stem (subs.) Stem (2 pce) Balance staff 45002 Balance staff (subs.) 44706 INCA / 45901 SSR Mainspring (subs.) 1,9x17,0x0,18 Mainspring (subs.) Battery