The RGMT Trench Chronograph is a captivating timepiece with a sturdy build and powerful performance. Crafted with Time Module Instruments ( TMI/ Seiko) Meca-quartz VK67 movement and a unidirectional turning bezel, it is waterproof up to 10 ATM and comes with an extra silicon strap for convenience and flexible styling. Movement: Japan Meca-quartz Chronograph Seiko (TMI/SII) VK67 is a popular hybrid mecaquartz movement that combines quartz timekeeping with a mechanical module for chronograph functions. It offers the precision of quartz seconds/month with the crisp feel and smooth 1/5-second sweep of a mechanical stopwatch, featuring 12-hour recording and a ~3-year battery life Case Material: Stainless Steel Case Size (mm): 47 Lug To Lug (mm): 49 Dial Colour: Grey Index & Luminous: Applied Index With Japan Luminous Lens: Mineral Glass Crown Type: Pull Out Strap Material: Stainless Steel , 24 mm +Extra Blue Silicon Strap Water Resistance (ATM): 10