Strong and elegant, stylish and confident. The newly relaunched Citizen Series 8 mechanical collection of modern timepieces makes an unforgettable impression with sophisticated designs and advanced automatic movements. The richly detailed 831 mechanical timepiece features a superior accuracy of -10 to +20 per day in a luxurious, gold-tone stainless case and blue calfskin leather strap, a glossy blue dial with luminous hands and markers, and an anti-reflective sapphire crystal. This modern Citizen automatic men’s dress watch also features enhanced magnetic resistance to protect the movement against external magnetic fields, a 42-hour power reserve and water resistance to 100 meters. Caliber number 9051. Product Details MODEL NB6012-18L 11/05/2021 MOVEMENT 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) 40 BAND TYPE Strap Leather and Silicone CASE MATERIAL Rose Gold-Tone Stainless Steel CRYSTAL Anti-Reflective Sapphire Crystal Impact and shatter resistant - anti-reflective coating deflects light CLASP Buckle DIAL Blue WATER-RESISTANCE WR100/10Bar/333ft [Swimming, Showering & Snorkeling] ADDITIONAL FUNCTIONS 42 Hour Power Reserve Antimagnetic 16000 -10~+20 s/d