Seamaster Planet Ocean 600M Co-Axial Master Chronometer 39.5

The Omega Seamaster Planet Ocean 600M Co-Axial Master Chronometer 39.5 mm (ref. 215.30.40.20.01.001) presents the Planet Ocean line's professional diving credentials in a more wearable 39.5 mm stainless steel case. Its black dial and robust 600-metre water resistance place it firmly in the tradition of serious dive watches, while the Co-Axial escapement and Master Chronometer certification elevate it well above purely functional tool-watch territory. Introduced in 2016, it remains a current reference in Omega's Seamaster catalogue.

The Planet Ocean collection was conceived as Omega's answer to the demand for a high-specification, deep-rated diver that could stand alongside the best professional dive watches in the world. The 39.5 mm case size was added to the line to broaden its appeal to collectors who found the larger Planet Ocean diameters less suited to everyday wear. Calibre 8800, introduced with the Master Chronometer generation, brought METAS certification, anti-magnetic resistance to 15,000 gauss, and the Co-Axial escapement to this more compact format. The reference has remained in continuous production since its 2016 debut, cementing its place as a versatile entry point into the Planet Ocean family.