OMEGA Omega Seamaster Seamaster Seamaster Ocean Universe 300m 300m Coaxial Master Chronometer 42mm 42mm Diving Watch 210.30.42.20.01.001 Stainless Steel Brushed Case Partially Polished Bezel Made of Black Ceramic with White Enamel Diving Scale Word Bezel  Ratcheting countdown bezel counterclockwise unidirectional rotation Dome-shaped sapphire mirror with anti-glare coating  , and covered with Super-LumiNova luminous coating, blue-green two-color luminous, green luminous display on the minute hand and green luminous point on the bezel for diving oxygen countdown, multiple waterproof screw-in crown, can be worn in real sea diving, conical shape row  Helium valve, corrugated edge design, transparent case back, movement beauty is clearly visible, replica 8800 movement, stainless steel brushed strap, the strap removal method is the same as the original one with screws on both sides, independent fixing rod in the middle design belt, folding  Double snap buttons, with press and fine-tuning extension, can be opened and extended to wear on the surface of the diving suit when diving, the diameter of the watch is 42mm