Wear your CITIZEN Nighthawk from day to night. This watch will match any style with crystal accents on the dial and dial ring. Black ion-plated stainless steel case and bracelet with gold-accented black dial features a 1/5-second chronograph that measures up to 60 minutes, 12/24-hour time, and date. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number B612.