Pre-owned/unworn Omega Seamaster Planet Ocean 600M ref 215.20.46.51.03.001. The Planet Ocean collection has evolved into one of OMEGA’s most luxurious professional dive watch platforms, pairing serious underwater capability with increasingly refined materials and finishing. This chronograph model combines stainless steel with Omega’s proprietary 18K Sedna gold, a rose gold alloy developed to maintain its warm tone over time. Paired with the deep blue ceramic dial and matching ceramic bezel, the result feels both sporty and very high-end. The oversized 45.5mm case gives the watch strong wrist presence, while the integrated chronograph layout and bold hour markers reinforce the Planet Ocean’s modern dive-watch identity. Omega’s Ceragold bezel technology adds another premium touch by seamlessly integrating the gold diving scale into the ceramic insert itself. Inside is the Master Chronometer caliber 9900 automatic chronograph movement with METAS-certified precision, anti-magnetic resistance, and Co-Axial technology. Add in 600 meters of water resistance and a helium escape valve, and this remains a true professional Seamaster beneath the luxury-forward execution. Shop OMEGA Seamaster Collection