Pre-owned Omega Seamaster Planet Ocean 600M Ultra Deep ref 215.30.46.21.06.001 (2023) takes the idea of a dive watch and pushes it well past what most people will ever need. The Ultra Deep traces back to Omega’s 2019 Five Deeps Expedition, where a prototype reached the deepest point on Earth. This is the production version of that watch, still made to extreme standards with a 6,000-meter depth rating and full ISO certification for saturation diving. The 45.5mm case is made from O-MEGASTEEL, giving it a slightly brighter, more corrosion-resistant finish than standard steel. The look is bold but well thought out. Grey-to-black gradient dial, bright orange accents, and a matching orange ceramic bezel that’s easy to read at a glance. The domed crystal adds to the overall presence, while the bracelet includes a built-in extension system for wetsuit use. Inside is the caliber 8912, a Master Chronometer movement designed for accuracy and anti-magnetic performance. Shop OMEGA Seamaster Collection