Series8 831 AUTOMATIC Thoughtful design meets an ultra-clean execution in this latest timepiece from Citizen, the new 831 joins the reimagined Series 8 collection of mechanical watches – pairing an elevated style with a high-performance automatic movements to fit every occasion.Balancing the worlds of robust design and refined styling, the 831 features a 40mm silver-tone, faceted stainless steel case alongside the best of Citizen's finishing techniques. With its matching stainless steel bracelet, the watch is ready for wear in any instance. Underneath a sapphire crystal, a green textured dial is as captivating as it is practical, playing in the light while being highly legible an account of its applied indices and the sharp design of hands. A 3 o'clock date window adds even more utility to the design, while the automatic mechanism which powers it secures the timepiece against strong magnetic fields. Water resistant up to 100 meters. Caliber 9051. MODEL NB6050-51WMOVEMENT TECHNOLOGY 9051 Automatic Powered by the release of a wound spring, mechanical movements never require a battery. Automatic mechanical movements have an oscillating weight that winds the spring with the motion of the wearer’s arm.CASE WIDTH (MM) 40BAND TYPE Bracelet Stainless SteelCASE MATERIAL Silver-Tone Stainless SteelCRYSTAL Anti-Reflective Sapphire Crystal Impact and shatter resistant - anti-reflective coating deflects lightCLASP Fold Over Clasp with Hidden Push ButtonsDIAL GreenWATER-RESISTANCE WR100/10Bar/333ft [Swimming, Showering & Snorkeling]ADDITIONAL FUNCTIONS42 Hour Power ReserveAntimagnetic 16000-10~+20 s/d*This item is BRAND NEW and will come with the original box and papers. We are authorized CITIZEN dealers, which means you will receive the manufacturer's warranty with your purchase.