Limited Edition of 1000 Pieces. Ball Watch Company Roadmaster Marine GMT Limited Edition DG3030B-S2C-GR. 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, it’s the world’s 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.