Omega Railmaster 40mm Co-Axial Master 220.10.40.20.01.001

Description

Omega Seamaster Railmaster Co-Axial Master Chronometer
Reference: 220.10.40.20.01.001
Condition: Pre-Owned

Specifications

• Case Material: Stainless Steel
• Case Size: 40mm
• Case Thickness: Approx. 12.7mm
• Lug-to-Lug: Approx. 47.9mm
• Lug Width: 20mm
• Crystal: Domed Scratch-Resistant Sapphire Crystal with Anti-Reflective Treatment
• Dial: Vertical-Brushed Black Dial
• Hands & Markers: Recessed Hour Markers and Hands Filled with Vintage-Toned Super-LumiNova
• Movement: Omega Co-Axial Master Chronometer Caliber 8806
• Power Reserve: Approximately 55 Hours
• Frequency: 25,200 vph / 3.5 Hz
• Functions: Hours, Minutes & Central Seconds
• Magnetic Resistance: Resistant to Magnetic Fields up to 15,000 Gauss
• Certification: METAS-Certified Master Chronometer
• Water Resistance: 150m / 500ft
• Crown: Screw-In Crown
• Bracelet: Stainless Steel Bracelet
• Case Back: Solid Stainless Steel with Naiad Lock System and Railmaster Seahorse Medallion
• Condition: Pre-Owned

The Omega Seamaster Railmaster 220.10.40.20.01.001 is a modern interpretation of one of Omega’s most purpose-driven professional watches. The original Railmaster was introduced in 1957 alongside the Speedmaster and Seamaster 300 and was specifically engineered for scientists, engineers, railway workers, and others who routinely encountered strong magnetic fields. This modern 40mm version preserves the Railmaster’s understated tool-watch character while dramatically advancing its technical capabilities.

Its vertically brushed black dial deliberately avoids unnecessary ornamentation, with recessed hour markers, a crosshair design, and vintage-toned Super-LumiNova creating a highly legible, instrument-like appearance. Unlike many modern luxury watches, the Railmaster remains intentionally discreet—the appeal lies in its proportions, functionality, and the historical purpose behind its design rather than overt branding.

Inside is the Omega Co-Axial Master Chronometer Caliber 8806, offering approximately 55 hours of power reserve and exceptional resistance to magnetic fields reaching 15,000 gauss. METAS Master Chronometer certification subjects the complete watch to rigorous testing for precision, magnetic resistance, power reserve, and water resistance. This capability is particularly appropriate for the Railmaster, transforming the anti-magnetic concept that defined the original model into a thoroughly modern mechanical watch.

With its versatile 40mm stainless steel case, 150 meters of water resistance, steel bracelet, no-date dial, and highly anti-magnetic movement, the Railmaster is an exceptionally capable everyday watch with a direct connection to Omega’s professional-watch heritage. Its understated appearance also makes the discontinued reference 220.10.40.20.01.001 an interesting alternative for collectors seeking something less common than the Speedmaster or Seamaster Diver 300M.

Alexanders Jewelers is located in Columbus, Ohio and has specialized in luxury watches and fine jewelry for over 20 years. We are members of Jewelers of America and the Better Business Bureau with an A+ rating. Every pre-owned luxury timepiece is carefully inspected for authenticity and condition. We offer financing options and accept all major credit cards and wire transfers.