OMEGA Speedmaster Moonwatch Professional

This Omega Speedmaster Moonwatch Professional, reference 310.55.42.50.13.001, is a chronograph in Sedna gold with a case diameter of 42 mm. The case measures 13.33 mm thick with a lug-to-lug span of 47.5 mm, and the brown dial sits under a sapphire crystal with anti-reflective treatment inside. Inside is the manual-winding calibre 3861, a Co-Axial chronograph 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 spring and offers 50 hours of power reserve. The watch has a small seconds subdial, a tachymeter scale, and is set with diamonds. A sapphire display back shows the movement, and the Sedna gold bracelet closes with a foldover clasp. Water resistance is rated to 50 metres.