Prospex Speedtimer Solar Chronograph Design inspired by Seiko's 1969 Speedtimer, one of the world's first automatic chronographs Powered by light energy – no battery change required 6–month power reserve once fully charged Chronograph measures up to 60 minutes of elapsed time in 1/5–second increments with split time measurement function Black dial Date calendar 24–hour subdial Vivid green LumiBrite hands and markers Curved sapphire crystal with anti–reflective coating on the inner surface Dual–tone black and gray tachymeter bezel Screwdown caseback Case diameter: 39.0 mm Stainless steel case and bracelet with black hard coating Tri–fold push button release clasp Water–resistant to 10 bar, 100 meters (330 feet) Caliber V192
