GRAHAM Chronofighter Oversize Black Arrow Technical details: CHRONO FIGHTEROVERSIZE BLACK ARROW Functions ? Chronograph (seconds, 30 minutes counter). Date at 8 o'clock ? Hours, minutes, seconds Movement ? Calibre G1747, automatic chronograph, 28'800 A/h (4Hz), Incabloc shock absorber ? 25 jewels ? Power reserve: 48 hours Case ? 47 mm steel with black PVD case ? Black carbon fast-action start/stop trigger and steel reset pusher with black rubber ? "Clous de Paris" high grip pattern ? Black ceramic bezel ? Domed sapphire crystal, anti-reflective coating on both faces ? Smoked sapphire crystal case back ? Waterresistance ? 330 feet / 100 m / 10 bar zdroj - http://www.masterhorologer.com/2015/05/graham-chronofighter-oversize-black.html