Limited Edition of 1000 Pieces. Ball Watch Company Roadmaster Marine GMT Limited Edition DG3030B-S2C-BK. The Ball Watch Company Roadmaster Marine GMT series is designed for perfect performance in the most imperfect situations. Engineered to the specifications of a 35 year Navy Mariner veteran, its the worlds first GMT timepiece with day and date functions, delivering utmost functionality. It’s precision, COSC certified. It’s case, tough titanium. Its mission, propel exploration further. The watch that once ran Americas railroads now empowers world explorers to live freely and fearlessly.