Omega Seamaster 300M Co-Axial Master Chronometer Mens Watch 210.30.42.20.01.001. Automatic movement with central seconds hand. Date window at 3 o`clock position. Black dial with index hour markers. Black ceramic unidirectional rotating bezel engraved with Arabic numerals set on a 42mm stainless steel case. Helium-escape valve at 10 o’clock position. Sapphire crystal on top and solid case back. Water resistant to 300M. Stainless steel bracelet.