Prospex Speedtimer Solar Chronograph. Design inspired by Seiko's 1969 Speedtimer, one of the world's first automatic chronographs. Chronograph measures up to 60 minutes of elapsed time in 1/5-second increments with split time measurement function. 

• Gray dial
• Date calendar
• 24-subdial
• Vivid green LumiBrite hands and markers
• Dual-tone black and gray tachymeter bezel
• Screwdown caseback
• Tri-fold push button release clasp