Omega Railmaster Railmaster Omega Co-Axial Master Chronometer 40 Stainless Steel / Grey / Strap

Reference 220.12.40.20.01.001

About this watch

The Omega Railmaster 220.12.40.20.01.001 embodies the perfect blend of classic styling and cutting-edge technology, making it a must-have for watch enthusiasts. This stunning timepiece boasts a 40 mm round stainless steel case with a matte grey finish, perfectly balanced dimensions, and a water resistance of 150 meters. The Master Chronometer certification ensures that the watch meets the highest standards of precision and performance, while its robust Omega caliber 8806 movement features 35 jewels for enhanced longevity. With a power reserve of 55 hours and resistance to magnetic fields up to 15,000 gauss, this watch is ideal for those who appreciate quality and style without being ostentatious.
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MSRP: $5,400
Market Price: $3,315

Key Features

  • 40mm round stainless steel case
  • Matte grey finish with stick and dot indexes
  • 150m water resistance
  • Master Chronometer certification
  • Omega caliber 8806 movement with 35 jewels
  • Power reserve of 55 hours
  • Resistance to magnetic fields up to 15,000 gauss

Specifications

Brand
Omega
Family
Railmaster
Model
Railmaster Omega Co-Axial Master Chronometer 40 Stainless Steel / Grey / Strap
Reference
220.12.40.20.01.001
Movement
8806
Movement Features
  • Hours, Minutes, Seconds
  • Chronometer, Co-Axial Escapement
Case
Stainless Steel 40mm
Dial Color
Grey
Crystal
Sapphire
Water Resistance
150

Current Listings

[WTS] Omega Seamaster Aqua Terra Railmaster 2504.52 — $6800— Catch & Release, Serviced by Omega, Full Set

Omega Seamaster Aqua Terra Railmaster 2504.52 — $6800— Catch & Release, Serviced by Omega, Full Set

Omega - 2504.52 · $6,800
This Omega Seamaster Aqua Terra Railmaster is a 36mm stainless steel watch featuring a black dial, automatic movement, and an Omega 1575 stainless steel bracelet.

  • Condition: Excellent, minimal wear
  • Case material: Stainless steel
  • Diameter: 36mm
  • Lug width: 19mm
Posted at
Apr 22, 2026, 12:40 AM
Active
[WTS] Omega Seamaster Railmaster, Grey/Silver, 40mm (full set- box and papers)

Omega Seamaster Railmaster, Grey/Silver, 40mm (full set- box and papers)

Omega - Railmaster · $3,200
A sleek and sporty GADA watch that has a lot to offer under the hood. It's a stealth ultimate tool watch that cleans up nicely.

  • Condition: excellent, pre-owned with minor signs of wear
  • Case size: 40mm
  • Serial number available: true
Posted at
Apr 21, 2026, 12:25 AM
Active
[WTS] Omega Seamaster Railmaster Grey Dial

Omega Seamaster Railmaster Grey Dial

This Omega Railmaster has a 38mm steel case on a steel bracelet with a gray gradient dial, and includes a full set of accessories.

  • Condition: Excellent pre-owned condition
  • Case size: 38mm diameter
  • Bracelet material: steel
  • Dial color: gray gradient
Posted at
Apr 19, 2026, 4:38 PM
Active
[WTS] Omega Railmaster 39mm 2503.52 for $2580 shipped!

Omega Railmaster 39mm 2503.52 for $2580 shipped!

Omega - 2503.52 · $2,580
The Omega Seamaster Railmaster 39mm delivers a simple design with its 3-6-9-12 markers and arrow indices, making it the ultimate everyday watch.

  • Condition: Satisfactory
  • Case Size: 39mm
  • Lug To Lug: 47mm
  • Movement Type: No Date Co-Axial Automatic
Posted at
Apr 19, 2026, 11:02 AM
Active
[WTS] Omega Railmaster Denim Dial on Bracelet - Omega Travel Box & Extra Strap Included - $2475

Omega Railmaster Denim Dial on Bracelet - Omega Travel Box & Extra Strap Included - $2475

A versatile Omega Railmaster Denim Dial on a bracelet with 150M water resistance and a 40mm case size that wears well. The watch is in good condition with minor signs of wear.

  • Condition: Used, minimal wear
  • Case diameter: 40mm
  • Water resistance: 150m
  • Bracelet size: 7-7.25 inch
Posted at
Apr 19, 2026, 8:55 AM
Active
[WTS] 2022 OMEGA Seamaster Railmaster 40mm - 220.10.40.20.01.001 - Full Set

2022 OMEGA Seamaster Railmaster 40mm - 220.10.40.20.01.001 - Full Set

A classic design by Omega, the Seamaster Railmaster 40mm features a vertical 'satination' pattern crosshair dial with fantastic lume, and comes as a full set from 2022.

  • Condition: Excellent pre-owned condition with minor visible wear throughout
  • Case Size: 40mm diameter
  • Movement: Omega 8806
Posted at
Apr 14, 2026, 8:32 PM
Active
[WTS] Omega Railmaster Grey Dial on Staib Mesh Bracelet & OEM Clasp on Rubber Strap

Omega Railmaster Grey Dial on Staib Mesh Bracelet & OEM Clasp on Rubber Strap

Omega - 22010402006001 · $2,625
This Omega Railmaster is a rugged, anti-magnetic watch designed for everyday use. It features a grey brushed dial and a high-quality Staib mesh bracelet.

  • Bracelet Size Range: up to 7.5 inches loose
  • Movement Type: co-axial master chronometer
Posted at
Apr 13, 2026, 5:35 PM
Active
[WTS] Omega Seamaster Railmaster 40mm[WTS]

Omega Seamaster Railmaster 40mm[WTS]

Omega - Railmaster · $3,300
A great first watch for any enthusiast, stainless steel brushed bracelet and bezel and case. No dent nor dings.

  • Condition: Great condition
  • Bracelet length: 40mm diameter
Posted at
Apr 12, 2026, 12:50 AM
Active
Omega Railmaster  - 220.10.40.20.03.001 - Blue - Steel - 40mm - Mint

Omega Railmaster - 220.10.40.20.03.001 - Blue - Steel - 40mm - Mint

This Omega Railmaster is a pre-owned, mint condition watch with a blue dial and stainless steel case. It has a 40mm diameter and features an automatic movement.

  • Condition: Pre-Owned - Mint
  • Case Size: 40mm diameter
  • Bracelet Type: Stainless Steel
  • Movement Type: Automatic
Posted at
Mar 10, 2025, 12:58 AM
Active