OMEGA Seamaster Railmaster Co-Axial Master Chronometer 40mm Watch Screw-In Crown while the caseback is stamped

while the caseback is stamped with the Constellation Observatory medallion

SBGW291 is a 36

800 A/m Magnetic Resistance: Offers protection against magnetic fields

and a 12 hours counter at 6 o'clock

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OMEGA Seamaster Railmaster Co-Axial Master Chronometer 40mm Watch Screw-In Crown while the caseback is stampedThe original OMEGA Railmaster of 1957 was a simple, practical, yet elegant watch designed for railway staff or anyone who worked close to electrical fields. Today, that spirit of innovation has been carried over into an updated model which enhances the Railmasters capabilities yet again. The 40mm symmetrical case is made from stainless steel with a wave edged design featured on the back. The vertically brushed grey dial includes brushed stainless