Pre-owned OMEGA Seamaster Planet Ocean 600M ref 217.32.42.21.01.001 (2025). Omega redesigned the Planet Ocean in 2025 to celebrate the collection’s 20th anniversary, introducing a noticeably slimmer and more refined take on the modern dive watch. While the original 2005 Planet Ocean drew inspiration from the vintage Seamaster 300 models of the 1960s, this fourth-generation release looks toward the sharper, more angular tool-watch designs of the late ‘70s and ‘80s. The updated 42mm stainless steel case features cleaner lines, revised bezel knurling, and a much thinner profile than previous generations, helping the watch wear far more comfortably on the wrist. Omega also removed the helium escape valve, giving the case a more streamlined appearance many collectors will appreciate. This reference pairs the redesigned case with a matte black dial, black ceramic bezel with a white enamel diving scale, and rhodium-plated hands and numerals filled with Super-LumiNova. Inside beats the Co-Axial Master Chronometer caliber 8912 with anti-magnetic resistance up to 15,000 gauss, a 60-hour power reserve, and METAS-certified accuracy. Shop OMEGA Seamaster Collection