Omega Speedmaster Moonwatch Co-Axial Chronograph White Side of the Moon Watch - 44.25 mm White Ceramic Case - Moonwatch Style Dial - White Leather Strap - 311.93.44.51.04.00244. 25 mm 18K white ceramic case, transparent back, bezel that features a matt chromium nitride tachymeter scale, scratch resistant sapphire crystal anti reflective treatment on both sides, Moonwatch style dial with two sub dials at 3 and 9 o'clock are also created in white ceramic with radiant 18K white gold applied indexes, tachymeter scale, Caliber Omega 9300 self winding movement with column wheel mechanism and co axial escapement, chronograph,