Omega experimented with anti-magnetic wristwatches as early as 1924 and up until 1952, but it was not until the release of the Railmaster in 1957, alongside the first iterations of the Seamaster and the Speedmaster, that the manufacture serially produced an anti-magnetic watch incorporating the culmination of their research and technical advancement. The Railmaster had relatively little success, in part due to its niche target market as well as strong competition from contemporaries like the Rolex Milgauss or the IWC Ingenieur reference 666. This resulted in both lower production numbers and a narrower production run of only six years (1957-1963), making original Railmaster watches from this era especially rare.

The first Railmaster was manufactured with the ability to withstand between 900 and 1000 gauss, specifically for those in professions required to withstand magnetic fields beyond what is considered normal. According to advertisements of the time, the Railmaster was targeted to “scientists, technicians, electricians, etc., who worked in close proximity to electrical currents.” Additionally, the Railmaster was water-resistant to 60 meters, or 200 feet.

The present timepiece was delivered to the Peruvian Air Force, or “Fuerza Aérea del Perú", whose initials FAP are engraved on the caseback and confirmed by Omega's Extract from the Archives. During the 1960s and 1970s, the Peruvian Air Force commissioned brands such as Omega and Rolex to create watches for their personnel.

The overall appealing condition, rare military provenance, classic "broad arrow" hands, sharp, dagger-like luminous indexes, and dial that is turning a pleasing chocolate brown color are elements that tick all the boxes for collectors of vintage watches.