Hamilton H64465733 Khaki Field King Auto 40mmInspired by Hamilton’s military heritage, our field watches are rugged and resilient. Perfect for after-dark heroics, the Khaki Field King Auto features a black PVD-coated case, black dial and black leather strap for the ultimate in stealth style.KHAKI FIELDFrom the original soldier's watch to rugged and robust new models designed for life's adventurers, the Khaki Field collection was inspired by military and built to last.STAINLESS STEEL CASEA highly resistant alloy composed of steel and chromium. It can be worked to resemble a precious metal. It is nearly impervious to rust, tarnish, and corrosion.SELF-WINDINGWrist movements cause the inner rotor to swing, transferring energy to the mainspring, and powering your timepiece.SAPPHIRE CRYSTALSynthetic sapphire crystal is a tough scratch-resistant material, only diamonds could leave a mark.WATER RESISTANCEYour timepiece is resistant up to 5 bar (50m) / 73 psi (164 ft).