OMEGA Speedmaster Moonwatch Professional

Omega's Speedmaster Moonwatch Professional, reference 310.30.42.50.01.002, 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 dial sits under a domed sapphire crystal with antireflective treatment inside. Inside is the manual-winding calibre 3861, a Co-Axial escapement movement certified as a Master Chronometer by METAS and resistant to magnetic fields up to 15,000 gauss. It runs on a free-sprung balance with a silicon balance spring and offers 50 hours of power reserve. The black dial carries a small seconds subdial and a tachymeter scale for the chronograph function. A sapphire display back on the case shows the movement. The steel bracelet closes with a foldover clasp with comfort setting, and the case is rated to 50 metres.