Omega Railmaster Co-Axial Master Chronometer 40mm 220.12.40.20.06.001

• Brushed stainless steel case.
• Brushed stainless steel bezel ring.
• Light grey (almost dark silver) dial with a fine linear brushed finish.
• Printed 3/6/9/12 Arabic numeral hour markers.
• Vintage colored luminous index hour makers.
• Fine printed minutes/seconds track.
• Hands with vintage colored luminous fill. 
• Screwed-in solid case back with the Seamaster Seahorse logo oriented & aligned with the watch, thanks to Omega’s patented Naiad Lock system.
• Movement:
• Omega caliber 8806, beats at 25,200 vph, contains 35 Jewels & has an approximate power reserve of 55 hours.
• Anti-magnetic: resistant to magnetic fields greater than 15’000 gauss.
• The movement features Omega’s “Si 14” silicon balance spring, which contributes to the movements outstanding resistance to shock and to environmental disturbances and thus to the watch’s chronometric performance.
• The movement also features Omegas Co-Axial Escapement which contributes to greater precision, stability & durability. The Co-Axial escapement has less friction & reduces the necessity of lubrication thus reducing the time intervals required between servicing

Alternate model # 22012402006001