Seiko's pivotal moment was becoming the official timekeeper for the 1964 Tokyo Olympics, and it continues as the World Athletics Official Timekeeper since 1985, overseeing 180+ events worldwide. This model's black sub-dials and 'black on black' dial ensure visibility with separate time and chronograph indicators. The hammer-shaped button simplifies stopwatch use. This model is driven by the in-house Solar chronograph calibre 8A50, offering measurements to the nearest hundredth of a second. The curved sapphire crystal has anti-reflective coating on the inner surface. • Powered by the solar powered movement with a power reserve of up to 6 months. • Presented on a silver stainless steel bracelet with push button deployment clasp. • Scratch resistant sapphire crystal glass. • 42.0mm case width. • 100 metre water resistance.