This watch is NOT affiliated with or built by Seiko Inc. This watch was custom built using a genuine Seiko automatic movement and non-original/aftermarket case, dial, hands, strap, bracelet, etc. Movement: Japan VK63 Quartz Chronograph Movement Hacking and Hand Winding. Case Material: 316L stainless steel. Watch Glass: Flat Sapphire Crystal with Cyclops.Strap Material: Stainless Steel Bracelet. Strap Style: Royal Oak Bracelet.