Seiko Prospex Speedtimer Mechanical Automatic Chronograph - SRQ037

Seiko - Prospex - Speedtimer Mechanical Automatic Chronograph - SRQ037Inspired by Seiko’s first precision chronographs, developed for international sporting competitions in 1964, and its 1969 introduction of the world’s first automatic chronographChronograph measures up to 30 minutes of elapsed time in 1/8-second incrementsColumn wheel and vertical clutch mechanism allows for smooth, stutter-free movement of the chronograph hand while providing longer wear and efficiency, and maintaining the power reserve better during chronograph operationMovement: Automatic, 34 jewels, caliber 8R4628,800 vibrations per hour Power reserve: 45 hours     Charcoal gray dial    Beige LumiBrite hands and markers    Dual curved sapphire crystal with anti-reflective coating on the inner surface    Screwdown see-through caseback    Case diameter: 42.5mm    Stainless steel case and bracelet with super-hard coating    Tri-fold push button release clasp    Water resistant to 10 bar, 100 meters (330 feet)