OMEGA Constellation

Omega's Constellation 131.63.41.21.01.001 measures 41 mm in yellow gold. The case is 13.5 mm thick with a 44 mm lug-to-lug span, and the black dial sits under a domed sapphire crystal with antireflective treatment on both sides. The Omega calibre 8901 drives it, a self-winding movement with Co-Axial escapement and a freesprung balance on a silicon spring, certified as a Master Chronometer with resistance to magnetic fields up to 15,000 gauss. Power reserve runs to 60 hours. Beyond the date, the watch adds a time zone function, and a sapphire caseback shows the 18K Sedna gold rotor and balance bridge finished with Geneva waves. A black leather strap with rubber and alligator surface closes on a yellow gold foldover clasp. The case carries a 50 metre water resistance rating.