OMEGA Seamaster Aqua Terra 150M

Omega's Seamaster Aqua Terra 150M, reference 220.50.41.21.10.001, is a 41 mm case in yellow gold with a green dial. The case measures 13.37 mm thick with a lug-to-lug of 48.01 mm, and it carries a domed sapphire crystal with antireflective treatment on both sides. Inside is the self-winding calibre 8901, a Master Chronometer movement certified by METAS with a Co-Axial escapement and resistance to magnetic fields of 15,000 gauss. It runs on a freesprung balance with a silicon spring and offers 60 hours of power reserve. The screw-down crown adds security, and the sapphire display back shows the movement's Geneva waves finish. Fitted to a yellow gold bracelet with a butterfly clasp, the case is rated to 150 metres.