Pre-owned/unworn Omega Seamaster Planet Ocean 600M ref 215.30.46.51.03.001 pairs the collection’s rugged specifications with a striking blue ceramic dial and matching ceramic bezel that give the watch a more refined appearance despite its serious capabilities. The layout is clean and very functional, featuring a running seconds register alongside a combined 60-minute and 12-hour chronograph counter designed for easier elapsed-time reading. Large hour markers, broad luminescent hands, and Omega’s Liquidmetal dive scale further emphasize the watch’s modern, highly legible aesthetic. At 45.5mm, this is a substantial sports watch, but that larger case size fits the Planet Ocean’s bold personality well. Plus, inside beats Omega’s Master Chronometer caliber 9900, a METAS-certified movement with a 60-hour power reserve and impressive anti-magnetic resistance. Shop OMEGA Seamaster Collection