Black Bay One 31 S&G tmc-M79663-0007 Manufacture Caliber MT5813 (COSC) with

Manufacture Caliber MT5813 (COSC) with chronograph function Self-winding mechanical chronograph movement with bidirectional rotor system

39mm yellow gold case

41mm steel case

Manufacture Caliber MT5652 (COSC) Self-winding mechanical movement with bidirectional rotor system Built-in architecture

Black Bay One 39 S&G M79673-0005

Black Bay One 31 S&G tmc-M79663-0007 Manufacture Caliber MT5813 (COSC) withBlack Bay One 31 S&G MODEL Black Bay One 31 S&G M79603 0001 FEATURES Manufacture Caliber MT5201 (COSC), tuned to 3 +5 seconds Self winding mechanical movement with bidirectional rotor system 31mm steel case, Steel and yellow gold bracelet