Omega Speedmaster Racing Co-Axial Master Chronograph Watch - 44.25 mm Steel Case - Black Ceramic Bezel - Matt Black Dial - 329.30.44.51.01.00244. 25 mm stainless steel case with antimagnetic design, transparent back, black ceramic bezel with tachymeter scale in orange wording and liquidmetal scale, domed scratch resistant sapphire crystal with anti reflective treatment on both sides, matt black dial with racing style minute track, caliber 9900 self winding Co Axial master chronometer movement with chronograph and date functions, approximately 60 hours of power reserve, stainless steel