Brand BAUME & MERCIER Caliber 12820 Size 12 1/2 Function CLD-AUT Version Hands 0,80x1,40 Stem 5416 Stem (subs.) Stem (2 pce) Balance staff 22901 INCA Balance staff (subs.) Mainspring (subs.) 1,0x9,5x0,10Sp Mainspring (subs.) Battery