OMEGA Speedmaster Moonwatch Professional

Omega's Speedmaster Moonwatch Professional 310.30.42.50.04.001 is a chronograph with a 42 mm steel case. The case measures 13.18 mm thick with a lug-to-lug of 47.5 mm, and the white dial sits beneath a sapphire crystal with anti-reflective treatment. Inside is the manual-winding calibre 3861, a Co-Axial escapement movement certified as a Master Chronometer and resistant to magnetic fields up to 15,000 gauss. It runs on a free-sprung balance with a silicon spring and holds 50 hours of power reserve. The chronograph includes small seconds and a tachymeter scale, and the caseback is transparent. A steel bracelet with a foldover clasp and comfort setting completes the watch. The clasp secures a case rated to 50 metres of water resistance.