Rolex GMT Master 16713BKSO-1 40mm Mens Automatic: A Timeless Classic The Rolex GMT Master 16713BKSO-1 is a masterpiece that combines functionality with elegance. Designed for the globetrotter, this watch allows the wearer to keep track… Rolex GMT Master 16713BKSO-1 40mm Mens Automatic: A Timeless Classic