Omega Speedmaster Limited Edition Moon to Mars Watch 3577.50.00. Manual winding chronograph movement. Stainless steel round case 42.0 mm in diameter. Fixed bezel with tachimeter function. Hesalite crystal. Black dial with luminiscent hands and hour markers. Small seconds sub-dial, a 30-minute recorder and 12-hour recorder designed as Earth, Mars and the Moon. Brushed and polished stainless steel bracelet with push button fold over clasp. Fits 8" wrist.