Omega Speedmaster Racing Co-Axial Master Chronograph Watch - 44.25 mm Steel Case - Black Ceramic Bezel - Sun Brushed Grey Dial - Brown Leather Strap - 329.32.44.51.06.001 Gold-Steel caliber 2385 self-winding movement with

caliber 2385 self-winding movement with chronograph

7 mm stainless steel case

steel bezel

44 mm 18K yellow gold case

5 mm 18K white gold case

Omega Speedmaster Racing Co-Axial Master Chronograph Watch - 44.25 mm Steel Case - Black Ceramic Bezel - Sun Brushed Grey Dial - Brown Leather Strap - 329.32.44.51.06.001 Gold-Steel caliber 2385 self-winding movement with44. 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, sun brushed grey 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, brown leather