The original soldier's watch gets an upgrade with hamilton's first-ever bronze case. Each khaki field mechanical bronze has a unique story that will unfold as its case develops a distinct patina over time. What story will your field watch tell? 38mm bronze case with titanium case back black dial with white numeral markers sapphire crystal powered by h-50 hand-wound movement boasting an 80-hour power reserve brown leather strap with buckle clasp 50-meter water resistance each khaki field mechanical bronze case will develop its own individual patina based on environmental exposure. Allow the patina to develop for a unique look. You may use a microfiber cloth to clean the watch.