OMEGA Speedmaster Moonphase

Omega's Speedmaster Moonphase, reference 304.30.44.52.01.001, is a chronograph with a steel case measuring 44.25 mm across. The case stands 16.85 mm thick with a lug-to-lug span of 50 mm, and a sapphire crystal with anti-reflective treatment covers the black dial. Inside is the self-winding calibre 9904, a column-wheel chronograph movement with a Co-Axial escapement and silicon balance spring, certified as a Master Chronometer and resistant to magnetic fields up to 15,000 gauss, with 60 hours of power reserve. Beyond the chronograph function, the dial carries a moonphase display, small seconds and a date by hand, plus a tachymeter scale on the case. A transparent caseback shows the finishing. The steel bracelet closes with a foldover clasp, and the case is rated to 100 metres.