Power reserve Approximately 60 hours Movement Description Automatic Swiss movement. Chronograph Strap Strap Material Leather Strap Color Black Strap Description Brown leather strap Clasp Type Buckle clasp Additional Information Water Resistance 100 meters - 330 feet New original Hamilton Khaki Aviation X-Wind Automatic Chronograph men's watch, black dial, leather strap, elegant men's watch, model H77616533. Polished stainless steel case with brown leather strap. Polished stainless steel buckle clasp. Fixed bezel with a slide rule. Dial Description: Luminous silver-tone hands, Arabic numeral hour markers, minute markers around the outer rim, 3 sub-dials, and a day-date display window at the 9 o'clock position on a black dial. Automatic Swiss movement. Chronograph movement. Sub-dial counters display: 60 seconds, 30 minutes, 12 hours, and day of the week. Calendar: Day of the week and date at the 9 o'clock position. The watch is powered by a Caliber H-21 engine with a power reserve of up to 60 hours. Watch functions: Power reserve, Chronograph, Hour, Minute, Second, Date, Day. Screw-down crown. Scratch-resistant sapphire crystal. Round case. Case diameter: 44 mm. Case thickness: 15.50 mm. Transparent case back. Water resistant up to 100 meters (330 feet)