The black and gray color scheme of this Hamilton Khaki Field Mechanical is a subtle approach to military styling. It is powered by the exclusive H-50 hand winding movement which is housed in a 38 mm case. Triangular indexes with old radium color Super-LumiNova® and a durable NATO strap complete the package.38mm Stainless Steel CaseLug width 20mmSapphire CrystalNato StrapMechanical movement80-hour power reserveWater Resistance 5 bar (50 m) / 73 psi (164 ft) Hamilton Style #: H69409930