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Citizen Eco-Drive presents a bold and sporty 1-second chronograph that measures up to 60 minutes, with 12/24 hour time, date, tachymeter, one-way rotating elapsed-time bezel and a 43mm screw-back case. Shown in stainless steel with brown dial and 100 meter water resistance. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number H500.