Pre-owned/unworn Omega Seamaster Planet Ocean 600M ref 215.30.40.20.01.001 stays true to the modern Planet Ocean formula with a black ceramic dial, matching ceramic bezel, oversized hour markers, and broad luminescent hands that make the watch exceptionally legible. Omega’s use of Liquidmetal within the bezel scale also helps preserve the crisp appearance of the insert over time while adding another layer of technical refinement to the watch. At under 40mm, this reference wears much more compactly than the larger 43.5mm and 45.5mm Planet Ocean models, making it especially versatile as an everyday sports watch. Inside beats Omega’s Master Chronometer caliber 8800, visible through the sapphire caseback. Certified by METAS, the movement offers impressive anti-magnetic resistance, excellent accuracy, and modern reliability. Shop OMEGA Seamaster Collection