Omega Speedmaster Racing Co-Axial Master Chronograph Watch - 44.25 mm Sedna Gold Case - Sun Brushed Blue Dial - Blue Leather Strap - 329.53.44.51.03.00144. 25 mm 18K Sedna gold case with antimagnetic design, transparent back, 18K Sedna gold bezel with blue ceramic ring and tachymeter scale in Ceragold, domed scratch resistant sapphire crystal with anti reflective treatment on both sides, sun brushed blue dial with racing style minute track, caliber 9901 self winding Co Axial master chronometer movement with chronograph and date functions, approximately 60 hours of power reserve, blue leather strap.