Omega Railmaster 188.8.131.52.01.002 Co-Axial Master Chronometer 38mm limited edition. The 1957 Trilogy. Omega Calibre 8806 movement. 55 hour power reserve. Polished and brushed stainless steel case. Water resistant to 60 meters. Black dial with index hour markers. Features include resistant to magnetic fields reaching 15,000 gauss. Free sprung-balance with silicon balance spring, automatic winding in both directions. Special luxury finish with rhodium-plated rotor and bridges with Geneva waves in arabesque. Steel bracelet with folding clasp. Box and papers dated December 2017.