Omega Planet Ocean 600 M Omega Co-axial Master Chronometer Chronograph Watch - 45.5 mm Steel Case - Unidirectional Black Ceramic Bezel - Black Ceramic Dial - 215.30.46.51.01.002 mm The Black Bay Chrono is

The Black Bay Chrono is the first chronograph in the TUDOR family

5 mm Steel Case - Blue Dial - Extra Blue Coated Nylon Fabric Strap

Caliber Omega 9300 self winding movement with column wheel mechanism and co-axial escapement

self-winding chronometer Omega 2627 movement with Co-Axial Escapement

Omega Planet Ocean 600 M Omega Co-axial Master Chronometer Chronograph Watch - 45.5 mm Steel Case - Unidirectional Black Ceramic Bezel - Black Ceramic Dial - 215.30.46.51.01.002 mm The Black Bay Chrono is45. 5 mm stainless steel case with anti magnetic properties and helium escape valve, transparent back, screw in crown, unidirectional rotating black ceramic bezel with orange rubber and Liquidmetal diving scale, scratch resistant sapphire crystal, black ceramic dial with Arabic numerals and a date window at the 6 oclock position, small seconds sub dial, as well as 60 minute and 12 hour counters on one dial, caliber Omega 9900 self winding Co Axial