Omega Constellation Globemaster Omega Co-Axial Master Chronometer Annual Calendar - 41 mm Steel And Sedna Gold Case - Black Dial - Black Leather Strap - 130.23.41.22.01.00141 mm steel and sedna gold case with anti magnetic protection, transparent back, domed scratch resistant sapphire crystal with anti reflective treatment on both sides, black pie pan dial with a month of the year on each of its facets, Calibre Omega 8922 self winding co axial master chronometer movement with date and annual calendar, approximately 55 hours of power reserve, black leather strap. Water resistant to 100 metres (330 feet).