This Omega Seamaster Railmaster features a 38mm steel case, grey dial, domed scratch-resistant sapphire crystal with antireflective treatment on both sides, calibre Omega 8806 self-winding movement with a Co-Axial escapement and a power reserve of 55 hours, screw-in exhibition caseback and is finished with a black calf leather strap and foldover stainless steel clasp. The serial number is A757540.