Pre-owned/unworn Omega Seamaster Planet Ocean 600M ref 215.30.46.51.01.002. Few modern dive watches balance technical capability and bold design quite like the Planet Ocean. Introduced in 2005 as a more robust evolution of the Seamaster family, the collection quickly became known for its oversized proportions, deep water resistance, and contemporary styling. Chronograph models like this one amplify that formula even further, giving the watch an especially aggressive and instrument-like personality on the wrist. This reference pairs a 45.5mm stainless steel case with a black ceramic dial and matching ceramic bezel accented by bright orange rubber detailing, one of the signature design cues that has become closely associated with the Planet Ocean lineup over the years. The chronograph layout keeps elapsed-time readings intuitive with combined counters at 3 o’clock, while the bold Arabic numerals and broad hands reinforce the watch’s highly legible tool-watch aesthetic. Despite its modern styling, this remains a serious professional diver beneath the surface, complete with 600 meters of water resistance, a helium escape valve, and an extendable clasp system built for dive use. Shop OMEGA Seamaster Collection