Rolex GMT Master 16713BKSO-1 40mm Mens Automatic: A Timeless Classic The Rolex GMT Master 16713BKSO-1 is a masterpiece of horological engineering, embodying the luxury and precision that the Rolex brand is renowned for. This model,… Rolex GMT Master 16713BKSO-1 40mm Mens Automatic: A Timeless Classic