The Omega Seamaster Railmaster Co Axial Master Chronometer Small Seconds 38mm is a 38 mm watch from the Seamaster Railmaster collection. Its stainless steel case is 12.36 mm thick and 44.92 mm from lug to lug, with 19 mm lugs. It is water resistant to 150 m. The crystal is sapphire.

The manufacturer’s list price is US$6,400. It comes in 2 versions, with brown dials.