Rough and rugged, the Khaki Field Mechanical watch from Hamilton returns to its roots with a bold design true to the original 1969 "Hack" watch. The manual winding mechanical movement features a 42-hour power reserve, and the watch has a 38mm sandblasted stainless steel case, green NATO strap with brown calfskin loops and "old radium" style Super LumiNova hands. The watch is water-resistant to 50 meters.