Railmaster Co-Axial Master Chronometer 40mm | Ref. 220.10.40.20.01.001 | Open-Dated Full Set

The Story

First introduced in 1957 alongside the Seamaster 300 and the Speedmaster, the Omega Railmaster was engineered specifically for scientists, railway technicians, and nuclear engineers working in environments with severe magnetic interference. The reference 220.10.40.20.01.001 represents a modern, stealth-luxury reimagining of that utilitarian heritage. By replacing shiny polished surfaces with a completely brushed steel finish, it avoids mainstream luxury bling to deliver a quiet, industrial statement piece tailored for the enthusiast who values functional independence, magnetic immunity, and historical tool pedigree over corporate flashiness.

The Craft: Brushed Industrial Design & The METAS Calibre 8806 Engine

The 40mm stainless steel case features an entirely satin-brushed finish, including the bezel and case flanks, eliminating glare and highlighting the rugged geometry of the lyre lugs.

The black dial is a masterclass in texture and legibility, featuring a deep vertical brush pattern that catches light in subtle metallic rays. The dial layout is defined by recessed, vintage-toned "fausse patina" Super-LumiNova triangular hour markers, a subtle central crosshair motif, and transfer-printed Arabic numerals at 3, 6, 9, and 12. Free from a date window, it maintains absolute visual symmetry.

Beneath the solid, oriented NAIAD Lock caseback beats the unstoppable In-house Co-Axial Master Chronometer Calibre 8806. Certified by METAS (the Swiss Federal Institute of Metrology), this automatic movement features a silicon balance spring and non-ferromagnetic components that render it immune to extreme magnetic fields up to 15,000 gauss. Operating with chronometric accuracy of 0/+5 seconds per day, it delivers a 55-hour power reserve, supported by a screw-down crown for a professional rating of 150 meters (500 feet) of water resistance.

Condition & Open-Dated Presentation Set

This collector-favorite Railmaster is presented in Very Good overall condition. The sapphire crystal, dial, bezel, and steel case flanks are in immaculate shape, with only light, honest desk-diving micro-hairlines present on the brushed steel bracelet links from careful previous wear.

The timepiece arrives as a True Complete Full Set, complete with its original Omega inner wooden presentation box, outer packaging, operating manuals, Pictogram card, METAS Master Chronometer card, and the original international warranty card—which is officially AD-stamped and left open-dated, maximizing long-term protection. Fully inspected and verified for timing precision, this 40mm black-dial tool classic is backed by our 1-year Honeyrock mechanical warranty.