Omega Seamaster Aqua Terra 150M Co-Axial 39.2 Railmaster / Black Alligator Ref. 2803.52.31

Introduced at BaselWorld 2003, the Aqua Terra Railmaster is a tribute to the Railmaster of the late fifties. The model presented here (ref. 2803.52.31) has a stainless steel case of 39.2mm and a black alligator strap. The original OMEGA Railmaster was first launched in 1957 – the same year as the now legendary Speedmaster model – as the successor to a watch created for the British Royal Air Force in 1953. Designed specially for scientists, technicians, electricians and railway workers, or anyone else working in or around powerful electric currents, it had a special double antimagnetic case to protect the watch movement from the harmful effects of these electrical fields. The outside case was made of Staybrite stainless steel, with a polished bevelled bezel, polished solid enveloping lugs, reinforced crystal and a screw-in back with O-ring gasket to ensure water resistance. The inside case consisted of a protective cap, a casing ring and a 1mm thick dial (as opposed to the 0.4mm for a standard dial) made of soft iron, which formed a screen against magnetic fields of over 900 Oersted in any position, as opposed to 60 Oersted for a conventional antimagnetic watch.