Pre-owned Omega Seamaster Planet Ocean 600M ref 215.23.46.51.03.001 (2022). The Planet Ocean collection was introduced in 2005 as OMEGA’s answer to modern professional dive watches, featuring greater water resistance, larger cases, and more robust movements than the standard Diver 300M. This example embraces that tool-watch foundation but adds a more elevated finish with a mix of stainless steel and Sedna gold. The 45.5mm case has a bold presence on the wrist, paired with a blue ceramic dial featuring luminescent hour markers, and a matching ceramic bezel with a Ceragold diving scale. It’s a lot of watch, but still well balanced on the wrist. Inside is the caliber 9900, a Master Chronometer chronograph movement visible through the sapphire caseback. With 600 meters of water resistance and a helium escape valve, this watch is meant for serious use, even if it spends most of its time above water. Shop OMEGA Seamaster Collection