Style Meets Function In The Citizen Nighthawk With A Sporty Appeal. Designed With A Granite Ion-Plated Stainless Steel Case And Bracelet With A Charcoal Gray Dial With Red Accents, The Advanced Features Include A 1/5 Second Chronograph That Measures Up To 60 Minutes, 12/24 Hour Time, And A Tachymeter That Measures Speed Based On Time Traveled Over A Distance. This Must-Have Men’S Watch Also Features A Screw-Down Crown, A Safety Foldover Clasp With Push Button, And Water Resistance To 200 Meters. Made With Our Proprietary Eco-Drive Technology That’S Sustainably Powered By Any Light And Never Needs A Battery, This Versatile Men’S Watch Becomes Your Weekday To Weekend Wardrobe Staple. Caliber Number B620.