Pre-owned Omega Seamaster Planet Ocean 600M ref 215.30.44.21.03.001. Omega introduced the Planet Ocean in 2005 as a modern dive watch capable of going far beyond the traditional Diver 300M, and it quickly became the brand’s flagship deep-water tool watch. This reference features a 43.5mm stainless steel case with a striking blue ceramic dial and matching ceramic bezel fitted with an Omega Liquidmetal™ diving scale. Large hour markers and bold hands filled with luminescent material make the dial easy to read in low light, which is exactly what you want from a watch meant for real underwater use. The stainless steel bracelet includes a practical diver’s extension clasp, while the screw-in caseback and helium escape valve support the watch’s impressive 600-meter water resistance. Shop OMEGA Seamaster Collection