The Omega Speedmaster Racing Co-Axial Master Chronometer represents the modernized 2017 evolution of the long-running Speedmaster Racing line, bringing the brand's METAS-certified Master Chronometer architecture into a 44.25mm steel case carrying the dial layout that has defined the Racing collection since the 1968 reference 145.016. The reference combines a brushed and polished stainless steel case with a black ceramic bezel ring carrying a Liquidmetal tachymeter scale, framing a dial with a distinctive racing-style minute track that gives the watch its name. Two sub-dials with blackened applied rings sit at three and nine o'clock alongside a date window at six, the rhodium-plated hour and minute hands paired with 18k white gold arrowhead indexes filled with white Super-LumiNova. Powered by the in-house Omega Caliber 9900, a Co-Axial Master Chronometer certified by METAS, beating at 28,800 vibrations per hour across 54 jewels with twin barrels mounted in series delivering an approximately 60-hour power reserve, the movement unaffected by magnetic fields up to 15,000 gauss. Water resistant to 50 meters with sapphire crystal. The Racing Master Chronometer sits as the modern catalog continuation of the long-running Speedmaster Racing line that originated with the 1968 reference 145.016. 2020 production, pre-owned condition.