OMEGA Seamaster Planet Ocean 600M (Big Blue)

Omega's Seamaster Planet Ocean 600M "Big Blue", reference 215.92.46.22.03.001, has a 45.5 mm blue ceramic case. It measures 17.38 mm thick with a lug-to-lug span of 51.5 mm, and the unidirectional rotating bezel matches the ceramic case. A domed sapphire crystal with antireflective treatment on both sides covers the blue dial. Inside is the self-winding calibre 8906, a Master Chronometer movement with a silicon balance spring, certified against magnetic fields up to 15,000 gauss and giving 60 hours of power reserve. As a GMT watch it tracks a second time zone, and the screw-down crown works with a helium valve for saturation diving. A blue rubber strap with a foldover clasp completes the piece. The case carries a 600 metre water resistance rating.