Pre-owned Omega Seamaster Planet Ocean 600M Ultra Deep ref 215.32.46.21.04.001 (2022) is about as far as Omega has ever pushed the Planet Ocean concept, both literally and technically. At 45.5mm, it’s unapologetically large, but the O-MEGASTEEL case and rubber strap keep it feeling purposeful rather than unwieldy. The white lacquered dial is surprisingly clean for such an extreme watch, with blue Arabic numerals, white-gold hands, and generous luminescent coating that stays easy to read in low light. A polished blue ceramic bezel adds a bit of contrast without feeling decorative. Rated to an almost absurd 6,000 meters and built to ISO saturation-diving standards, this is a watch that exists because Omega wanted to see how far it could go. Most owners won’t test its limits, but that’s part of the appeal. It feels overbuilt in the best possible way. Shop OMEGA Seamaster Collection