Brand BULOVA Caliber 11 AOACB Size 11 1/2 Function Version Hands Stem = 11 AO (eigen) Stem (subs.) Stem (2 pce) Balance staff 27614 Balance staff (subs.) Mainspring (subs.) 1.10x10.0x0.11 AUT Mainspring (subs.) = 2638X ( 11ANAC) Battery