The Speedtimer Prospex watch collection embodies Seiko's professional timekeeping legacy. Seiko's history was transformed when it became the official timekeeper for the 1964 Tokyo Olympics, despite no prior experience. This legacy continues with Seiko as the World Athletics Official Timekeeper since 1985, serving over 180 events worldwide. Driven by the in-house Solar chronograph calibre 8A50 with a Quartz Solar movement allowing it to operate for approximately 6 months, it provides precise 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.