OMEGA Constellation

Omega's Constellation 131.30.41.21.99.001 is a 41 mm steel watch with a grey dial. The case measures 13.4 mm thick and 44 mm lug to lug, with the dial covered by a domed sapphire crystal treated with anti-reflective coating on both sides. Inside is the self-winding calibre 8900, a Master Chronometer movement certified by METAS and resistant to magnetic fields of 15,000 gauss. It runs on a free sprung-balance with a silicon balance spring and two barrels in series, giving 60 hours of power reserve. The watch also has a date function and a time zone display, and the transparent caseback shows the rhodium-plated rotor. A steel bracelet with a foldover butterfly clasp completes it. Water resistance is rated to 50 metres.