OMEGA Speedmaster Moonwatch Professional

The Omega Speedmaster Moonwatch Professional, reference 310.20.42.50.99.001, has a 42 mm case in steel and Sedna gold. The case measures 13.18 mm thick with a lug-to-lug of 47.5 mm. A sapphire crystal with anti-reflective treatment inside covers the pink dial. Inside is the manual-winding calibre 3861, a Co-Axial chronograph movement certified as a Master Chronometer and resistant to magnetic fields of 15,000 gauss, with a 50 hour power reserve. This is a chronograph, and it adds a tachymeter scale and small seconds. The display back shows the movement finishing, including the rhodium-plated bridges with Geneva waves. A steel and gold bracelet closes with a foldover clasp with comfort setting. The case carries a 50 metre water resistance rating.