Limited Edition of 1000 Pieces. Ball Watch Company Engineer Hydrocarbon AeroGMT Limited Edition DG2118C-S7C-BK. Built to handle the best of the worst. Its unrivalled innovation and impenetrable toughness includes our patented triple folding buckle and extension system for bracelets, special crown guard, ultimate shock protection and our most robust water resistance. With striking bezel designs and a cutting-edge use of micro gas tubes, this collection is ready for any battlefield.