OMEGA Speedmaster Moonphase

Omega's Speedmaster Moonphase, reference 304.63.44.52.02.001, is a chronograph case in yellow gold measuring 44.25 mm across. The case stands 17.05 mm thick with a lug-to-lug span of 50 mm. Inside is the self-winding calibre 9905, a column-wheel chronograph with Co-Axial escapement and a silicon balance spring, certified as a Master Chronometer and resistant to magnetic fields up to 15,000 gauss. The silver dial sits under a sapphire crystal treated with anti-reflective coating on both faces. Beyond the chronograph function, the watch shows a moonphase display alongside small seconds and a hand-set date, with a sapphire display back revealing the movement. It rides on a black alligator leather strap with a yellow gold folding clasp. Water resistance reaches 100 metres, or 10 bar.