The Sumo models have been upgraded with a new movement that provides a 70 hour power reserve. The new automatic 6R35 operates at 21,600 bph and provides a hand wind capability. The crystal has also been upgraded to sapphire. These models are available in a black and a green colour way.FeaturesCase Material: Stainless Steel Movement: 6R35Jewels: 24Power Reserve: 70 hoursCrystal: Sapphire crystal Bezel: UnidirectionalWater resistance: 200mDiameter: 45.0mm3 YEAR WARRANTY AUTHORIZED SEIKO DELAER