Pre-owned Omega Seamaster Planet Ocean 600M ref 215.33.44.21.03.001. When Omega introduced the Planet Ocean collection in 2005, the goal was to create a more robust and technically capable evolution of the Seamaster dive watch formula. Larger cases, higher depth ratings, and more contemporary styling quickly made the Planet Ocean a favorite among collectors who wanted something sportier and more substantial on the wrist than the standard Diver 300M. Over the years, the collection has also become a showcase for some of Omega’s most advanced materials and movement technology. The example you see here features a striking blue ceramic dial and matching blue ceramic bezel fitted with a Liquidmetal diving scale. The 43.5mm stainless steel case gives the watch a strong wrist presence without feeling excessive for a professional dive watch, while the blue leather strap with rubber backing adds a slightly more refined everyday feel compared to a full bracelet configuration. Shop OMEGA Seamaster Collection