Omega Speedmaster Moonwatch Omega Co-Axial Chronograph Grey Side of the Moon Meteorite Watch - 44.25 mm Grey Ceramic Case - Senda Gold Bezel - Meteorite Dial - Grey Leather Strap - 311.63.44.51.99.00244. 25 mm grey ceramic case, transparent back, 18K Senda gold bezel with a silicon nitride ring and brushed Ceragold tachymeter scale, sapphire crystal with anti reflective treatment on both sides, meteorite dial made from a solid piece of ancient extra terrestrial stone that has been acid etched to reveal a unique pattern on each watch, caliber 9300 self winding movement with chronograph function, approximately 60 hours of power reserve, grey leather