Seamaster Railmaster Co-Axial Master Chronometer 40 mm - Secret highlight: Master Chronometer technology for only €3,300
Concept & History
The Railmaster was introduced in 1957 as a professional instrument for engineers and scientists working in strong electromagnetic fields. The current reference 220.12.40.20.06.001 transforms this purely functional requirement into the modern age. Unlike historical models, which relied on soft iron cages, the resistance here is achieved using non-magnetic alloys in the movement itself. This technical evolution positions the model as a robust alternative within the Seamaster collection.
Market position & opportunity
This Railmaster is currently one of the most underrated models on the market. While comparable Omega technology often costs well over €5,000, this model offers an entry into the world of Master Chronometers at a price that is otherwise only available for standard movements.
Technology & condition
The built-in Caliber 8806 is identical to movements in much more expensive Seamaster models: Anti-magnetic up to 15,000 gauss, METAS-certified and extremely robust. The watch comes from 2020, is in mint stock condition (NOS) and comes in a complete full set.
Aesthetics & wearing comfort
The gray dial with a vertical cut gives the watch a technical toolwatch character. The original textile strap ensures maximum comfort and lightness.
Tip: Thanks to the standard lug width of 20 mm, this watch can be perfectly combined with any leather or NATO strap to completely change the look.
All photos show exactly the item we offer - no stock images!
This item is taxed in accordance with § 25 A UStG - VAT cannot be shown.
For more information, see Technical Details.























