Brand B.F.G. Calibre 20 Size 13 Function Version Hands 1,10x1,90 Stem 8904 Stem (subs.) Stem (2 pce) Balance staff 48603 Balance staff (subs.) 46505 / 44201 Mainspring (subs.) 1,6x15,0x0,17 Mainspring (subs.) Battery