Seamaster Planet Ocean 600M Co‑Axial Master Chronometer 43.5 MMThis 43.50 mm stainless steel model features a white ceramic dial with applied Arabic numerals in orange and a date window at the 3 o’clock position. The orange ceramic unidirectional bezel includes a diving scale filled with liquid ceramic and Super-LumiNova.Other features include an alveol screw-in caseback and an integrated stainless steel bracelet with patented extendable foldover clasp and diver extension.The watch is water resistant to 600 metres / 2000 feet / 60 bar and has a helium-escape valve. The OMEGA Master Chronometer calibre 8900 at the heart of this timepiece can be seen through the transparent caseback. To achieve Master Chronometer status, it has passed the 8 rigorous tests set by METAS (The Swiss Federal Institute of Metrology).FEATURESAnti‑magnetic Chronometer Date Helium escape valve Master Chronometer Certified Screw‑in crown Time zone function Transparent caseback Unidirectional rotating bezel