Pre-owned Omega Seamaster Planet Ocean 600M ref 232.90.46.21.03.001 is undoubtedly robust at 45.5mm, but still wears quite nicely on the wrist in full titanium. The metal finish also delivers a unique grey hue that we think complements the blue dial and bezel quite nicely. As with most serious divers, the bezel is unidirectional for safer underwater timekeeping and is furnished here in blue ceramic with a Liquidmetal™ diving scale. The dial is in a matching shade of blue and features a date window at 3 o’clock, as well as the Seamaster’s signature arrow-shaped hands. The case is also outfitted with a Helium Escape Valve for deep saturation diving, allowing it to explore depths of up to 600 meters. Powering it all is the caliber 8500 Co-Axial self-winding mechanical movement. Shop OMEGA Seamaster Collection